The BEST episodes of Sgt. Frog season 1

Every episode of Sgt. Frog season 1, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Sgt. Frog season 1!

Sergeant Keroro is the Captain of the Space Invasion Forces Special Advance Team of the 58th Planet of the Gamma Storm Cloud System, sent to the planet Pekopon (aka Earth) to collect intelligence for his planet's invasion force. He is also a frog. After his ship crash-lands in the planet, he takes shelter in the Hinata household, but the two kids, Fuyuki and Natsumi, find him and take away his alien weapons. When his people discover that the Pokoponians are aware of him, Keroro is abandoned - left to fend for himself in this hostile world. But he's not alone - four other pre-invasion agents were are also lurking on Earth. It's invasion of the weird in this wacky comedy hit!

Last Updated: 2/25/2024Network: TV TokyoStatus: Ended
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War of the World's Cup! / Friend Him Like Beckham
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#1 - War of the World's Cup! / Friend Him Like Beckham

Season 1 - Episode 42 - Aired 1/22/2005

Inspired by watching World Cup soccer on TV, Keroro plans on pitting the superior Keronian forces against the best Earth has to offer - on the soccer field. Answering this challenge on the planet's behalf is Paul Japan, a team of top soccer players handpicked by Paul to defend the pride of soccer as a human sport. Tamama makes friends with a boy he sees practicing his soccer moves everyday. He joins the boy in his daily routine, and even teaches him his trademark Jealousy Ball, adapted for soccer into the Jealousy Shoot - which destroys the boy's old soccer ball by accident. Fortunately the vast resources of the Nishizawa Peach Group fix the ball exactly as it was. Eventually, the boy learns to shed his defensive mindset and play better than he ever could, and Tamama has someone he can truly call a friend.

Lost in Transportation
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#2 - Lost in Transportation

Season 1 - Episode 31 - Aired 10/30/2004

A restless Keroro hops on his new space motorbike KRR-SP and takes off... His bike breaks down and strands him in the middle of nowhere. Cold, hungry and lonely, Keroro wants to go home, but can't. He doesn't even know where he is, except in the mountains. It's now up to Natsumi to go out and bring her stupid frog back home.

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Hot Spring Hilarity!
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#3 - Hot Spring Hilarity!

Season 1 - Episode 34 - Aired 11/20/2004

After experimenting with several types of fortune-telling, Momoka learns that her romantic destiny with Fuyuki will be realised in an onsen. Thus she engineers a scheme of her own, allowing Fuyuki to 'win' an onsen trip for the whole Hinata family and one guest... problems arise when Keroro and Koyuki have their minds set on that guest ticket at the same time. While Keroro is easily dispatched with the task of solving a Rubik's Cube, Kururu forces Momoka and Koyuki to battle each other for the guest ticket, and tradition clashes with technology as Koyuki pits her ninja skills against Momoka's new robotic battlesuit! Fuyuki is late for school, while Keroro is fleeing Natsumi's wrath after breaking her mug - the two meet each other on a shortcut to school. With Mutsumi standing in for the narrator, the simple act of walking down this seldom-used lane, filled with old memories and new discoveries, turns into an evening to remember.

The Birthday the Earth Stood Still
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#4 - The Birthday the Earth Stood Still

Season 1 - Episode 35 - Aired 11/27/2004

Natsumi's birthday rolls around this year, and Keroro has big plans for a surprise party. However, Fuyuki has doubts in this plan; not least because Natsumi told him that she thought parties were childish. So, will the party work?

A Frog in Winter
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#5 - A Frog in Winter

Season 1 - Episode 36 - Aired 12/4/2004

Winter looms and temperatures take a dive - Keroro is introduced to Fuyu-Shogun, the General of Winter, which is really just a term given to the cold air currents originating from Siberia, but Keroro visualises Fuyu-Shogun as something resembling Demon Emperor Arago from Yoroiden Samurai Troopers. When the simple act of stepping out the front door proves too much for Keroro, he decides to go through endurance training to combat the cold front, and subjecting the Hinata children to the blizzard simulation against their will only shows them to be far more resourceful than Keroro was. When Tamama tells Momoka about the blizzard simulation and the accidents that followed, Momoka offers to let the Keroro platoon continue training on her private snowy mountain resort - with the real intention of getting closer to Fuyuki, as usual. While the Keroro platoon starts trekking up the hazardous snowy mountains, Momoka puts her own plan into motion, activating the mountain resort's snow generators - but Kururu chooses to activate his private satellite's weather manipulation function at the same time, and the mountain resort is plunged into an artificial ice age.

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Storefront Shinobi!
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#6 - Storefront Shinobi!

Season 1 - Episode 37 - Aired 12/11/2004

Keroro's latest scheme involves making Dororo give ninja lessons to raise money for the platoon. When nobody actually signs up for said lessons, Keroro makes the rest of the platoon learn Dororo's ninja arts instead - but none of them seem to be serious about learning anything. To make matters worse, 556 sees their ninja lessons as competition against his own attempt to give Space Detective lessons, and tries to shut the operation down. After Natsumi's radio show was interrupted by 556's invasion, it gets interrupted yet again by a pterodactyl flying into her room - it turns out that Keroro, inspired by a certain Hollywood movie, is using Keronian technology to clone dinosaur DNA and open a theme park featuring said dinosaurs. Using Kururu's mind control apparatus, Keroro has tamed a tyrannosaurus into doing his bidding, but an accident causes the mind control cone to come off the T-Rex's head (and onto Giroro's head), causing it to run wild through the underground base.

One Potato, Two Potato, Sweet Potato, Amore
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#7 - One Potato, Two Potato, Sweet Potato, Amore

Season 1 - Episode 38 - Aired 12/18/2004

As part of a galactically-broadcast Candid Camera-esque program, Keroro plays a prank on Giroro, with the help of a Pekopon suit modelled after Natsumi, with Sumomo at the controls. Hilarity ensues as Giroro distracts himself from faux-Natsumi's advances with physical training and weapons maintenance - causing an exasperated Sumomo to attack Giroro, and incurring the wrath of the real Natsumi when she sees her own towel-clad self leaping across town. When she opts to stop them on her own, Kururu gives her his latest invention - the Natsumi battlesuit. Natsumi finds herself stuck with Kururu's battlesuit, which has a tendency to activate when anyone nearby utters something even remotely sounding like the attack command. When the invade command kicks in, the battlesuit AI takes over Natsumi completely, causing her to destroy anything the Keroro platoon sends after her. Giroro is forced to confront her as well, and Kururu gives him the battlesuit deacivation code... "Natsumi, my love. Kiss me tender and hold me tight, forever!"

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The Space Frog Who Stole Christmas
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#8 - The Space Frog Who Stole Christmas

Season 1 - Episode 39 - Aired 12/25/2004

Keroro hatches a new scheme for the Christmas season, but Dororo and Tamama refuse to go with it for different reasons. Tamama tells Keroro about Santa Claus, who knows when you've been naughty or nice, prompting Keroro to carry out investigations on Santa Claus. Unfortunately the Christmas season of cheer and good will begin to take effect, as Keroro's remaining loyalists Giroro and Kururu desert him as well. Left to his own devices, Keroro begins to discover the Christmas spirit in a way he hadn't really expected. Keroro is unusually hot-blooded about spring-cleaning time, taking charge of housecleaning operations in the Hinata household, and imparting valuable tips and tricks to the Hinata family. At the end of the day, human and Keronian alike sit down for noodles, listen to the bells, and welcome the new year.

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We Don't Needs No Education!
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#9 - We Don't Needs No Education!

Season 1 - Episode 40 - Aired 1/8/2005

It's the first episode of the new year - and the Keroro platoon's New Year celebrations involve subjecting Giroro to different forms of abuse for some reason. While discussing new year resolutions, Angol Mois is reluctant to reveal hers, until a reaction in her alien physiology, triggered by Keroro's suspiciously glowing 'red bean soup', causes her to go completely berserk. The Keroro platoon receive some mail from well-wishers at home, the Keronian children - and at least one reminder from Keron high command, ordering Keroro to submit a large amount of overdue homework immediately. With the help of his loyal troops, Keroro overcomes every possible distraction and completes the homework on time... but one last obstacle looms on the horizon...

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A Low Down Dirty Game!
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#10 - A Low Down Dirty Game!

Season 1 - Episode 41 - Aired 1/15/2005

Kururu develops a seemingly innocent board game which shrinks Natsumi and Fuyuki and places them in the middle of the action. Landing on any rewards and penalties on the squares turns them into reality, and while Fuyuki gets sidetrips to assorted wonders of the world, Natsumi winds up executing one impossible stunt after another. The final square is revealed to trigger the Keronian invasion, but this scheme falls apart as the square before it summons Angol Mois' father, the original Destroyer of Worlds! Inspired by the sight of 556's attention-grabbing antics, Dororo asks him for help - and is fed with 556's vitriol and drive for life. Returning to the Keronian base, a pumped-up Dororo rallies his fellow soldiers, pushing them through all forms of training in order to master a new combined battle technique - but all his efforts to strengthen his own presence fall flat, as the other four promptly forget about him the moment they put their training to actual use.

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Bag Of Secrets!
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#11 - Bag Of Secrets!

Season 1 - Episode 2 - Aired 4/10/2004

Momoka Nishizawa, a shy classmate of Fuyuki's who has an enormous crush on him, and has an alter ego, brings a surprise to school; Tamama, who just so happens to be in Keroro's platoon! But as we venture through this day further on, we begin to learn that there is more to than just the innocent and cute covers of Momoka and her alien partner. Momoka and Tamama are coming over to the Hinata household! Will Momoka be able to call Fuyuki a friendly 'Fuyuki-kun', instead of a formal 'Hinata-kun'? How will Tamama behave? What will turn out in the end?

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Springtime for Hitters!
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#12 - Springtime for Hitters!

Season 1 - Episode 43 - Aired 1/29/2005

nspired by a Japanese fairytale of the Red and Blue Oni, Keroro devices a plan to win over Natsumi. Playing the Blue Oni, a bad guy who was only doing so to bring happiness to his friends, he tries to force a romantic situation between her and Giroro. However, nothing goes to plan and the special romantic moment is shared by the Red and Green Alien instead. Deciding that it is better to be the Red Oni, Keroro is quickly pelted with soybean by Natsumi on Setsubun. Wanting revenge, he has Kururu turn her into an Oni girl via the Oni ray gun. Now all soybean products are attacking Oni Natsumi and not even Giroro can save her. Being cornered, Natsumi almost yields to Keroro until Fuyuki reveals that Natsumi is a Thunder God.

Domo Arigato, Aki Roboto!
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#13 - Domo Arigato, Aki Roboto!

Season 1 - Episode 44 - Aired 2/5/2005

Kururu proposes a formal competition to compare human and Keronian physical proficiency. Natsumi, still seething after the events of episode 17, accepts Keroro's challenge, whereupon Keroro picks Fuyuki as his opponent. Momoka's snowy mountain complex forms the backdrop as Keroro and Fuyuki go to battle in winter sports, but one unexplained phenomena after another (a freak updraft, a stray missile, a bobsled rail coming off for no reason) threaten to throw the competition into disarray. All the happenings in the first act are finally explained - Kururu's true intention was to build and test his new giant robot (which eager test pilot Hinata Aki dubs the Autumn H), without unnecessary distracions from the Hinata children and his fellow soldiers. Unfortunately Aki goes crazy with the robot's weapons, forcing Kururu to move out in the Kururu Robo to bring her in, resulting in all the unexplained phenomena from the first act.

V for Valentinedetta!
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#14 - V for Valentinedetta!

Season 1 - Episode 45 - Aired 2/12/2005

It's the day before Valentine's day, and Keroro, inspired by the sales of chocolate on this occasion, plans on cashing in by manufacturing and selling traditional ikinari dango or sweet potato snacks, as a substitute for traditional Valentine's Day chocolate. Unfortunately, all the marketing and promotional power of the Keroro platoon fail to overturn international tradition, and Keroro is left with stacks and stacks of ikinari dango that will haunt him for many episodes to come. Valentine's Day arrives at last, and whether it be chocolate handmade from store-bought ingredients or coca flown from Ghana by the Nishizawa Peach Group, Natsumi and Momoka are on a sacred mission to give their chocolates to the men in their lives (Saburo and Fuyuki respectively), but each has her own obstacles to overcome - Natsumi's own nerves get the better of her at each turn, and Momoka watches helpless as Fuyuki receives Valentine's Day chocolate from other girls (Fuyuki himself has a different sort of problem, in the form of the combined jealousy of the menfolk of Kisshou Gakuen.)

Ghost in the Cell!
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#15 - Ghost in the Cell!

Season 1 - Episode 46 - Aired 2/19/2005

Spooky happenings take place in the Hinata household, and Natsumi is first to point fingers at Keroro - but Keroro's air-tight alibi leaves everyone puzzled. This somehow leads to bigger unexplained manifestations, and finding the logical explanations for them leads to one final manifestation, as the Hinata house ghost is sick and tired of everyone forgetting her existence by simply explaining it away. A ghost with a grievance is a powerful thing indeed, as the house ghost spirits Natsumi and Keroro away, and her long and painful history is revealed at last - as a child, she found a kappa (an amphibious Japanese demon), befriended it, and was deemed a heretic and locked in a vault by her fellow villagers for it...

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Frogs and Dolls!
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#16 - Frogs and Dolls!

Season 1 - Episode 47 - Aired 2/26/2005

The story begins with Natsumi inviting Koyuki to spend Hinamatsuri, the Japanese Girls' Festival, at the Hinata household. Keroro intervenes once again, hoping to 'spice up' the traditional festival in his own way, and Kururu unveils his newest invention - Kururuko, a magical girl style Pekopon suit, its perfect human likeness spoiled by Kururu's attempt at a girly voice from inside it. Kururuko then proceeds to send the humans into a holographic realm, introducing them to Hinamatsuri, Outer Space style. Debuting in this episode is Dance Man, the white-suited afro-coifed singer of the Afro Gunso closing theme... and Dasonu Maso, his alien bootleg version. The story begins when Keroro tricks Natsumi with what appears to be a Dance Man concert ticket, but ripping off the counterfoil summons Dasonu Maso from deep space, and Natsumi is subjected to the truths of Dasonu Maso as well as the threat of her very own afro....

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Lazy Days and Mondays Always Get Me Down!
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#17 - Lazy Days and Mondays Always Get Me Down!

Season 1 - Episode 48 - Aired 3/5/2005

Springtime rolls in at last, and a form of seasonal laziness begins to affect all people - which inspires Keroro's latest scheme, to channel the energies of the world's laziest lifeforms and use it against the people of Earth. Kururu creates a reactor chamber to house this 'Keron March Energy', and a successful test with 556 as the subject is run, but things go horribly wrong when Kururu opens the reactor to let out 556... and all the Keron March Energy at the same time... Keron March Energy spreads rapidly throughout the city, and it's up to Fuyuki, protected from the ominous fog by his diving suit from episode 20, to put a stop to this. Making his way through the underground base, Fuyuki uncovers one cryptic clue after another, and finally locates Keroro - trapped by the now self-aware Keron March Energy (bearing a strange resemblance to Ayanami Rei of Neon Genesis Evangelion), which threatens to bring about the end of the world with March Impact.

How to Succeed In Pekopon-Conquering Without Really Trying!
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#18 - How to Succeed In Pekopon-Conquering Without Really Trying!

Season 1 - Episode 49 - Aired 3/12/2005

Kururu passes on to his platoonmates his new 'life policy' - do something you don't normally do. After seeing Natsumi and Fuyuki react to Kururu's revised behavior with gratitude, the other Keronians take to this new attitude with great zeal - Keroro in particular gets the wrong idea and winds up doing a lot of needless and ultimately annoying things. Even his personal attempt at triggering the Pekopon Invasion goes awry when his congenital ineptitude gets the better of him. March 14 is White Day, the day that boys who received Valentine's Day chocolates (re. ep 45) get to give something back, and Momoka gets a box of cookies from Fuyuki, which she proceeds to display in her private vault (the cookies that is). However Momoka is looking forward to something more - the perfect date with Fuyuki. Paul enlists the Nishizawa Peach Group's vast resources to create the Super Version Simulator, a virtual reality chamber to determine every possible outcome of Momoka's date with Fuyuki, taking into account every possible situation, down to possible interference from practically every other character in the show... save for one...

No More Mr. Nice Frogs!
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#19 - No More Mr. Nice Frogs!

Season 1 - Episode 50 - Aired 3/19/2005

After doing some digging around in his tent, Giroro comes across a DVD of the Keroro Platoon's press conference before they left for Earth. While watching, he realizes just how far the Keroro Platoon has fallen from their original duties. The Keroro Platoon decides to go back to its old ways and take over the Hinata house. But how can they get past Natsumi Hinata, the demonlord of the house? Or will a serious fever take her down for them? An irregular fever causes Natsumi to go bedridden, with the Platoon fearing for her life. Giroro's love for Natsumi gets the best of him once more as he battles with a Space Cerberus.

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A Farewell To Arms, Legs, and Other Froggy Parts!
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#20 - A Farewell To Arms, Legs, and Other Froggy Parts!

Season 1 - Episode 51 - Aired 3/26/2005

Keroro was asked by the conductor for them to go back to Keron. Kururu then erases all the humans' memories. What will become of them?

Actor Schmactor!
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#21 - Actor Schmactor!

Season 1 - Episode 29 - Aired 10/16/2004

It's time for the school drama club's annual production. Natsumi's two recurring classmates Yayoi and Satsuki beg her to help them in their stage production of Peter Pan, and while Koyuki relishes the idea of performing alongside Natsumi, it turns out that stage acting is one of the few things Natsumi is completely hopeless at. Keroro offers his assistance yet again, subjecting Natsumi to all forms of stage training - but just as she gets her act together, the sight of Saburo in the audience watching her performance reduces her to the same hopeless state she began in. Keroro intervenes in full view of the audience, and rapidly escalating chaos ensues. Also in the audience was one of the three new characters debuting - the Kissho Academy Newspaper Club aka KGS. It turns out that they have been carrying out their own investigations on every one of the Keroro platoon's school infiltration shenanigans, down to Fuyuki's connection to these alien invaders, and they plan to break into the Hinata household to search for evidence - but Keroro, now grounded and barred from Gunpla-shopping after being spotted by the KGS in public, has every intention of taking the battle to them.

Meet The Sergeant!
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#22 - Meet The Sergeant!

Season 1 - Episode 1 - Aired 4/3/2004

We are introduced to Keroro, an eccentric and blundering alien who came to destroy and conquer Earth, and is living as a slave under the roof of the Hinatas, a perfectly normal family who had lived a perfectly normal life: The mother, Aki, is an extremely busy and beautiful manga editor who rarely spends time with her teenage children; Fuyuki is the gentle-hearted and paranormal-loving son and Natsumi is the sweet but hot-tempered daughter with extremely great athletic skills, and who despises Keroro, while Fuyuki is intensely interested about him. After a few weeks of living with the Hinatas, Keroro gets his own room that is rumoured to be haunted by a ghost! However, the turn-out of the room is a big surprise for the Hinatas later on.

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Blood! Violence! Death! Kill!
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#23 - Blood! Violence! Death! Kill!

Season 1 - Episode 4 - Aired 4/24/2004

Here, we meet the serious and aggressive Giroro, and he's set deadly traps for Fuyuki and Natsumi! He's already captured Fuyuki, but can he really stand a chance against the athletic Natsumi? Is there maybe even a chance that he might... fall in love?! Giroro is very upset over the sergeant's lazy behavior, so he devises a plan to make the old, charismatic, and battle-loving Keroro come back. But then things start to get very awry, and only when a surprise guest comes to the Hinata household does Keroro really get defeated!

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The Day The Gundam Cried!
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#24 - The Day The Gundam Cried!

Season 1 - Episode 5 - Aired 5/1/2004

Keroro is targeting an old toy store to get his hands on a new Gundam model, but the thing is that it's about to be demolished! Can Keroro stop this, or will he end up learning a lesson?

Apocalypse Later!
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#25 - Apocalypse Later!

Season 1 - Episode 7 - Aired 5/15/2004

According to Nostradamus, the Lord of Terror will come and will reign over Earth in the year 1999. However, it's 2004 and the Lord has finally arrived... in the image of a Shibuya kogal high school girl. And in spite of her lateness, she still intends to fulfill her assignment and destroy Earth, along with the Gunpla modeling factory. Now it's up to everyone to either help or hinder her. Mois has been spending a lot of time with Keroro in the Hinata household, and Tamama is very jealous. So when Tamama cooks up a plan to finish her up... but could this alien that is dark with jealousy defeat someone as pure and innocent as Mois?

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