The BEST episodes of Underdog

Every episode of Underdog ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Underdog!

There's no need to fear! Underdog is here! When criminals in this world appear And break the laws that they should fear And frighten all who see or hear The cry goes up both far and near For Underdog! Underdog! Underdog! Underdog! Speed of lightning, roar of thunder Fighting all who rob or plunder Underdog. Underdog! When in this world the headlines read Of those whose hearts are filled with greed Who rob and steal from those who need To right this wrong with blinding speed Goes Underdog! Underdog! Underdog! Underdog! Speed of lightning, roar of thunder Fighting all who rob or plunder Underdog. Underdog! ** The original airing order of the episodes is not available, but if you uncover it or have some info to add, please submit it. Thanks. **

Last Updated: 7/18/2025Network: NBCStatus: Ended
Saif Waif
star
8.92
51 votes

#1 - Saif Waif

Season 1 - Episode 1 - Aired 10/3/1964

Underdog breaks out of the phone booth, and hears the cries for help again. Underdog flies to the lady, who tells him that her little boy has been accidentally locked in a bank vault. With only this information, Underdog flies off toward the bank. He reaches a bank, crashes in, much to the shock of the occupants, and then proceeds to rip open the giant door to the vault. The bank president blows up at Underdog, saying that he's got the wrong bank! So, Underdog flies to the correct bank, and attempts to rescue the boy. But at first, nothing he tries works. He crashes through the vault door, only to crash through the whole building and the one next door as well. He tries using his X-ray vision to locate the boy, but instead, starts a fire! All the people in the bank are in a panic now! Underdog uses his atomic breath to blow out the fire, and in the process, blows virtually the whole building away! But at least the mother's little boy is found all safe and sound.

Watch Now:AmazonApple TV
Go Snow (4)
star
8.67
3 votes

#2 - Go Snow (4)

Season 1 - Episode 8 - Aired 10/24/1964

Watch Now:AmazonApple TV
Zot (4)
star
8.50
4 votes

#3 - Zot (4)

Season 1 - Episode 12 - Aired 11/7/1964

The story of Zot concludes, as Underdog and the princess are about to be married. Just at that moment the evil two-headed dragon attacks the city. Underdog defeats the dragon and saves the city. King Klobber grants underdog a favor and he asks to be allowed to return to Earth without marrying his daughter. The King agrees and the princess decides she was in love with the Prime minister of Zot all along and all are happy.

Watch Now:Amazon
The Bubbleheads (1)
star
8.50
2 votes

#4 - The Bubbleheads (1)

Season 1 - Episode 25 - Aired 12/26/1964

Watch Now:Amazon
Simon Says Be My Valentine (2)
star
8.00
1 votes

#5 - Simon Says Be My Valentine (2)

Season 3 - Episode 34 - Aired 2/11/1967

Shoeshine Boy sees Cad and his henchmen kidnap Polly. He must let them beat him up to protect his secret identity. He waits in line for the phone booth while Polly is told of the machine, handcuffed to a pole and gagged.

Underdog Versus Overcat (1)
star
8.00
1 votes

#6 - Underdog Versus Overcat (1)

Season 3 - Episode 1 - Aired 9/17/1966

The planet Felina's milk wells have run dry which makes the evil ruler Overcat mad. He and his men go to Earth and steal all the cows. However, they don't know how to get the milk from them so they grab someone who does... Sweet Polly!

Simon Says Be My Valentine (1) - The Candy Mine (Klondike Kat) - Hula Hoop Havoc (The Hunter) - Simon Says Be My Valentine (2)
star
8.00
1 votes

#7 - Simon Says Be My Valentine (1) - The Candy Mine (Klondike Kat) - Hula Hoop Havoc (The Hunter) - Simon Says Be My Valentine (2)

Season 3 - Episode 33 - Aired 2/11/1967

Simon invents the Valentine Vault which turns people into paper valentines. He orders Cad and his two henchmen to kidnap Sweet Polly... to set a trap to catch Underdog in the machine.

The Marbleheads (3) - So Hard to Guard (Klondike Kat) - Duck Haunter (Tooter Turtle) - The Marbleheads (4)
star
8.00
1 votes

#8 - The Marbleheads (3) - So Hard to Guard (Klondike Kat) - Duck Haunter (Tooter Turtle) - The Marbleheads (4)

Season 3 - Episode 16 - Aired 11/5/1966

In this final episode, Shoeshine asks for a drink of water after being placed in his cell. When he gets it from the guard he tosses it into the guards eyes. The next phase of their plan is to get the Granite Gun which is in the throne room of Captain Marblehead who is enjoying his meal. Polly attempts to clobber the Captain with a pipe, but it has no effect on his stone head. He then calls for the guards who round up the prisoners. In the confusion, the guards hurl a projectile at the prisoners who duck and allows it to break open a wall to reveal a phone booth. Shoeshine sees this opportunity and changes into Underdog. He races to free the prisoners only to face Captain Marblehead and the Granite Gun. Underdog gets temporarily made of stone but then breaks free. He then melts the Granite Gun with his x-ray vision. After defeating Captain Marblehead, he tells him to mine his own rocks in the quarry and then heads home and frees all those who were turned to stone.

The Marbleheads (3)
star
8.00
1 votes

#9 - The Marbleheads (3)

Season 3 - Episode 15 - Aired 11/5/1966

Just before they are ready to head home with their slaves they captured with the Granite Gun, Crusher and Gravel are confronted by the army. Using the Granite Gun, the stoneheads defeat the army and head for Planet Granite. They then present the slaves to Captain Marblehead who orders them cracked open from their stone enclosures. He explains that they were brought to mine the rocks for the food for the Marbleheads and orders them sent to the mines. While working in the mine, Polly tries to call for Underdog, but with him disguised in his Shoeshine Boy persona, he has no place to change. He then suggests a revolt and the group makes a plan.

The Marbleheads (2)
star
8.00
1 votes

#10 - The Marbleheads (2)

Season 3 - Episode 14 - Aired 10/29/1966

After all the reporters and news crew leave the site of the strange object, two stonehead creatures from the planet Granite, named Gravel and Crusher, emerge from the craft with their Granite Gun. Their mission is to collect 10 slaves to bring back to their planet to work in the rock mines. After reporting in to their fearless leader, Captain Marblehead, the two buffet on some of Earth's stones and marble. They then proceed with their mission and collect 10 slaves, which so happen, include Shoeshine Boy and Sweet Polly. Before they leave for home, they are observed and the army tries to stop them.

The Marbleheads (1) - The Big Fromage (Klondike Kat) - Quarterback Hack (Tooter Turtle) - The Marbleheads (2)
star
8.00
1 votes

#11 - The Marbleheads (1) - The Big Fromage (Klondike Kat) - Quarterback Hack (Tooter Turtle) - The Marbleheads (2)

Season 3 - Episode 13 - Aired 10/29/1966

A strange object crash-lands on earth. A group of scientists check out the mysterious object, determining that it's a harmless, dead comet. The scientists leave the scene unaware of the fact that a secret door opens from the center of this strange thing and two evil looking space aliens emerge from this strange object.

The Just in Case (4)
star
8.00
1 votes

#12 - The Just in Case (4)

Season 3 - Episode 12 - Aired 10/22/1966

Polly watches helplessly as Underdog fall victim to the witch doctor's voodoo spell. Luckily, a passing sea gull grabs the Underdog doll and takes it to a remote island. There, a monkey takes the doll to the top of a volcano, preparing to throw the doll in. In the meantime, Riff Raff And his Ghost Ship Gang sneak aboard the Queen May and begin to loot the ship. Needing every ounce of his super strength to break the witch doctor's spell, Underdog takes one of his super energy pills. Free of the spell, Underdog flies to the Queen May with a paintbrush and a bucket of paint. Before long, the ghost ship is reveled by the superhero-cum-artist. Riff Raff and his Ghost Ship Gang are captured, and returned to prison.

Watch Now:Apple TV
The Just in Case (3) - Secret Weapon (Klondike Kat) - Drafthead (Tooter Turtle) - The Just in Case (4)
star
8.00
1 votes

#13 - The Just in Case (3) - Secret Weapon (Klondike Kat) - Drafthead (Tooter Turtle) - The Just in Case (4)

Season 3 - Episode 11 - Aired 10/22/1966

Riff and his gang decide to rob one more vessel before they go for their biggest catch, The Queen May. But, Polly has hidden herself as a decoy so that she can call for Underdog once she is on board the Ghost Ship. When the gang opens the contents of the merchant ship they just robbed, Polly emerges and runs calling for Underdog. They capture her but the gang is fearful that her cries will bring Underdog. At this point, Riff finally reveals what 'Just in Case' is,...Just in Case Underdog comes! The disguised fella is really a witch doctor who, along with a voodoo doll in the form of Underdog, is able to manipulate our hero and leave him helpless

The Just in Case (1) - Honor At Steak (Klondike Kat) - Mish Mash Mush (Tooter Turtle) - The Just in Case (2)
star
8.00
1 votes

#14 - The Just in Case (1) - Honor At Steak (Klondike Kat) - Mish Mash Mush (Tooter Turtle) - The Just in Case (2)

Season 3 - Episode 9 - Aired 10/15/1966

The prison warden's chief officer informs him that Riff Raff is assembling a gang and is planning on escaping. They feel that they need to tell Underdog, so they send for Sweet Polly to call for him. When Polly arrives, the chief officer explains what was overheard in the prison from some of the prisoners that Riff has obtained as part of his gang. Polly then calls for Underdog, who, disguised as shoeshine boy, is stalled waiting for a woman to exit the phone booth he needs to change in. Upon hearing that Underdog has been called, Riff makes the decision that his newly formed gang needs to leave immediately, taking with them a disguised little fella. When the gang asks why he needs to be taken along, Riff responds, 'Just in Case.'

The Big Dipper (4)
star
8.00
1 votes

#15 - The Big Dipper (4)

Season 3 - Episode 8 - Aired 10/8/1966

Simon has finally forced the people of the city and the world to give him ultimate power. Underdog is still stuck in the polluted mud of what was once the Atlantic Ocean. He swallows a super energy pill from his ring and, regaining his super powers, he flies back to the city and tricks the two villains into giving him all of Simon's jars of water. In retaliation, Simon prepares to destroy the Big Dipper with his pistol. Our hero takes the gun away from Simon and knocks the two villains out. Underdog refills the world's entire waterway, saving the world once again.

The Big Dipper (2)
star
8.00
1 votes

#16 - The Big Dipper (2)

Season 3 - Episode 6 - Aired 10/1/1966

Simon and Cad have invented a device to drain off the world's water supply. The pair travels around the world and steal all of the world's water. When Simon steals the Atlantic Ocean, he leaves Underdog stuck in the polluted mud of what was once the Atlantic Ocean.

Underdog Versus Overcat (4)
star
8.00
1 votes

#17 - Underdog Versus Overcat (4)

Season 3 - Episode 4 - Aired 9/24/1966

At first it look like Overcat is going to win. But even though he's as strong as Underdog, he's not fast. Underdog uses his speed to beat Overcat. When the cats kick Overcat out of Felina, Underdog gives them coconut trees so they never run out of milk.

Watch Now:Apple TV
Underdog Versus Overcat (3)
star
8.00
1 votes

#18 - Underdog Versus Overcat (3)

Season 3 - Episode 3 - Aired 9/24/1966

Polly gives Underdog his energy pill and he beats Overcat's men. Next, Underdog takes Polly and the cows back to earth. Overcat challenges Underdog to a fight for the cows. If Underdog refuses, Overcat will attack Earth.

Underdog Versus Overcat (2)
star
8.00
1 votes

#19 - Underdog Versus Overcat (2)

Season 3 - Episode 2 - Aired 9/17/1966

Polly tells Overcat about Underdog but he is not worried; he kidnaps her to milk the cows. Polly calls for Underdog. When he gets to Overcat's planet, he is placed in a rubber ball trap that drains his energy. He is taken to help Polly milk the cows.

Batty Man (4)
star
8.00
1 votes

#20 - Batty Man (4)

Season 3 - Episode 28 - Aired 1/14/1967

Polly and our hero have been placed onto the conveyor belt of Batty Man's bowling ball presser. The steam from the machine loosens Polly's chains, enabling her to give Underdog his super energy pill. His strength renewed, Underdog flies out to capture Batty Man, Georgie and their bat army, recovering the gold. Our hero returns the gold to Fort Knox and then turns the villains over to the authorities.

Simon Says Be My Valentine (3) - Rotten To The Core (Klondike Kat) - Taxi Turtle (Tooter Turtle) - Simon Says Be My Valentine (4)
star
8.00
1 votes

#21 - Simon Says Be My Valentine (3) - Rotten To The Core (Klondike Kat) - Taxi Turtle (Tooter Turtle) - Simon Says Be My Valentine (4)

Season 3 - Episode 35 - Aired 2/18/1967

Shoeshine Boy finally transforms into Underdog. He frees Polly, but she faints before warning him about the Valentine machine. Underdog charges in but is crushed flat and turned into to a paper valentine. Then Simon tells Cad and the henchmen to load the machine in to a truck to take it to City Hall to turn the Mayor into a paper valentine. Before they go, they re-handcuff Polly to the pole so when she comes to she can look at her beloved hero

Simon Says Be My Valentine (4)
star
8.00
1 votes

#22 - Simon Says Be My Valentine (4)

Season 3 - Episode 36 - Aired 2/18/1967

Polly pulls the handcuffs off of the pole and cries over her now-paper hero. Then she hears the familiar saying, "The secret compartment of my ring I fill with an Underdog energy vitamin pill." She sees Underdog is flat but all right. She finds a flat energy pill in the ring and when she give it to him he breaks out of the Valentine, takes the handcuffs off her hand and they fly to City Hall. There, Underdog saves the mayor and stuffs Simon, Cad and the two henchmen in the machine. Polly turns them into Valentines.

Round and Round (2)
star
8.00
1 votes

#23 - Round and Round (2)

Season 3 - Episode 18 - Aired 11/12/1966

After returning from a strange planet and wearing a charm that the alien from the planet he brought back to Earth with him, Underdog is interviewed by Sweet Polly about the rescue and retrieval of the alien. However, once he stands up, he becomes dizzy as things begin to spin around. Back on the strange planet, Zorb explains that as long as Underdog wears the charm around his neck, he will become dizzy. He then checks on Cron, who is being examined by scientists. Cron is caged when he becomes agitated. He then takes a pill Zorb gave him which causes him to grow and break free.

Watch Now:Apple TV
Round and Round (3)
star
8.00
1 votes

#24 - Round and Round (3)

Season 3 - Episode 19 - Aired 11/19/1966

When Underdog gets dizzy during an interview after returning from a strange planet, he is rushed to the hospital where the doctors try to find the cause. Meanwhile, the alien grows so big, he breaks out of the lab where he was being examined. Underdog hears the cries for help and leaves the hospital to face the now giant alien. But the charm around his neck causes him to get dizzy, and the giant toys with him.

Round and Round (3) - Gravy Train (Klondike Kat) - Frankfurter Fix (The Hunter) - Round and Round (4)
star
8.00
1 votes

#25 - Round and Round (3) - Gravy Train (Klondike Kat) - Frankfurter Fix (The Hunter) - Round and Round (4)

Season 3 - Episode 20 - Aired 11/19/1966

In the final episode, the giant finishes toying with Underdog and bats him back to the hospital. With Underdog out of the picture, the Army, Navy and Air Force is called into action against the giant. The giant conquers all the armed forces. Polly explains to Underdog that they were all defeated. Hearing this, Underdog tries to leave, but Polly grabs him by the charm around his neck. In the tug-of-war the charm breaks and Underdog is no longer dizzy. Underdog faces the giant and then punches him so hard, he lands back to his home planet.