The BEST episodes of H2O: Mermaid Adventures

Every episode of H2O: Mermaid Adventures ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of H2O: Mermaid Adventures!

“H2O – Mermaid Adventures” is a combination of comedy, friendship and adventures, both on land in Dolphin City and in a marvelous and magical undersea world. The brand-new animated series is taking the original concept of the world-hit live-action series to a whole new level. While exploring the mysterious Island of Mako, three quite ordinary teenage girls fall under a spell that changes their lives. From now on, whenever water splashes any one of them, they are transformed into mermaids! Endless situations and missions draw the three friends into the incredible underwater world where they make new friends: Bernie the hermit crab, Zita the inquisitive eel, Teddy the kid turtle, Sue the mystical manta ray and Carlotta the diva-jellyfish – and have endless fun and wonderful, enchanting adventures under the sea.

Last Updated: 1/19/2023Network:Netflix
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Jaws-ache!
star
8.25
4 votes

#1 - Jaws-ache!

Season 1 - Episode 12 - Aired 5/22/2015

A shark with a toothache seeks some relief onshore, but its presence could dampen Dolphin City's tourism season.

Watch Now:iTunes
Caught in the Net
star
8.25
4 votes

#2 - Caught in the Net

Season 1 - Episode 2 - Aired 5/22/2015

Emma enters a sand-castle competition. Meanwhile, Cleo looks after a challenging intern and rescues an injured sea turtle.

Watch Now:iTunes
Three Days Underwater
star
8.00
2 votes

#3 - Three Days Underwater

Season 2 - Episode 8 - Aired 7/15/2015

When a spell forces Rikki to remain a mermaid until the next full moon, she has to find a way to lay low -- and underwater -- for three full days.

Watch Now:iTunes
The Secret of Mako Island
star
7.57
7 votes

#4 - The Secret of Mako Island

Season 1 - Episode 1 - Aired 5/22/2015

Three teen girls are stranded on Mako Island, where a pool of water transforms them into mermaids in the series premiere of this animated version of "H2O: Just Add Water."

Watch Now:AmazoniTunes
A Stormy Party
star
7.50
4 votes

#5 - A Stormy Party

Season 1 - Episode 4 - Aired 5/22/2015

A storm puts a birthday bash at a yacht basin in jeopardy, so the gals try to save the party and the birthday boy.

Watch Now:iTunes
Kidnapped!
star
7.50
2 votes

#6 - Kidnapped!

Season 2 - Episode 4 - Aired 7/15/2015

Bobby's twin brother gets abducted by someone in a curious speedboat.

Watch Now:AmazoniTunes
The Lost Ring
star
7.33
3 votes

#7 - The Lost Ring

Season 1 - Episode 13 - Aired 5/22/2015

Rikki takes action after she spies on her dad and grows concerned about his relationship with his new girlfriend.

Watch Now:AmazoniTunes
Bad Waves
star
7.25
4 votes

#8 - Bad Waves

Season 1 - Episode 11 - Aired 5/22/2015

Lewis and the gals investigate some puzzling sound waves disturbing the whales, dolphins and mermaids.

Watch Now:AmazoniTunes
Memory Lapse
star
7.12
33 votes

#9 - Memory Lapse

Season 2 - Episode 2 - Aired 7/15/2015

Cleo forgets about her ability to change into a mermaid, so Emma and Rikki must make sure she doesn't transform in public

Watch Now:iTunes
Dolphin City Mascot
star
7.09
33 votes

#10 - Dolphin City Mascot

Season 1 - Episode 10 - Aired 5/22/2015

Danny the octopus is snatched by an observation center, putting the upcoming volleyball tournament in jeopardy.

Watch Now:iTunes
Imminent Danger
star
7.06
31 votes

#11 - Imminent Danger

Season 2 - Episode 12 - Aired 7/15/2015

Having played one too many practical jokes, Teddy can't get anyone to believe his warning that an underwater volcano is about to erupt.

Watch Now:iTunes
Valentine's Day
star
7.00
33 votes

#12 - Valentine's Day

Season 2 - Episode 3 - Aired 7/15/2015

Lewis wants to share a big secret with Abby on Valentine's Day, and Cleo worries that he will tell her about the girls' mermaid identities.

Watch Now:AmazoniTunes
Trapped
star
7.00
2 votes

#13 - Trapped

Season 2 - Episode 13 - Aired 7/15/2015

Lewis joins a famous explorer in a high-tech submarine to hunt for a sunken treasure ship, but a mishap strands them at the bottom of the sea.

Watch Now:AmazoniTunes
Reported Missing
star
7.00
33 votes

#14 - Reported Missing

Season 2 - Episode 1 - Aired 7/15/2015

In the Season 2 opener, clown fish begin to vanish, so the girls investigate why this is happening.

Watch Now:iTunes
Dolphin City Triangle
star
7.00
32 votes

#15 - Dolphin City Triangle

Season 1 - Episode 8 - Aired 5/22/2015

An atmospheric disturbance leads to big trouble in Dolphin City and earns it the name "the new Bermuda Triangle."

Watch Now:iTunes
The Return of the White Mermaid
star
6.93
30 votes

#16 - The Return of the White Mermaid

Season 2 - Episode 7 - Aired 7/15/2015

To protect the White Mermaid, the girls guide explorer Stanley Finch to the underwater stone circle, whose magic makes Stanley think he's a pirate.

Watch Now:AmazoniTunes
The White Mermaid
star
6.83
6 votes

#17 - The White Mermaid

Season 1 - Episode 3 - Aired 5/22/2015

The girls find an old mermaid statue and intend to return it to an undersea wreck, but some treasure hunters may foil their plans.

Watch Now:AmazoniTunes
Poseidon's Daughter
star
6.80
5 votes

#18 - Poseidon's Daughter

Season 1 - Episode 9 - Aired 5/22/2015

Celebrities and a Hollywood production crew arrive in Dolphin City to shoot a movie, and trouble comes along as well.

Watch Now:iTunes
The Mysterious Seaweed
star
6.75
4 votes

#19 - The Mysterious Seaweed

Season 1 - Episode 6 - Aired 5/22/2015

Emma is assaulted by some blue seaweed, which takes away her mermaid powers.

Watch Now:iTunes
It's in the Bag!
star
6.67
3 votes

#20 - It's in the Bag!

Season 1 - Episode 7 - Aired 5/22/2015

Lewis and the girls go to great lengths to stop the harm that discarded plastic bags are posing to the sea turtles.

Watch Now:AmazoniTunes
Handle with Care
star
6.67
3 votes

#21 - Handle with Care

Season 2 - Episode 6 - Aired 7/15/2015

Tired of the racket Miriam and Zane are making at their beach party, Bernie leaves his cave -- giving the Vandals a chance to move right in.

Watch Now:iTunes
Mako Island Hotel
star
6.50
4 votes

#22 - Mako Island Hotel

Season 1 - Episode 5 - Aired 5/22/2015

The girls try to halt the building of a luxury resort on Mako Island.

Watch Now:AmazoniTunes
A Strange Phenomenon
star
6.00
1 votes

#23 - A Strange Phenomenon

Season 2 - Episode 5 - Aired 7/15/2015

Cleo has some powerful nightmares after her father goes to sea on a mission.

Watch Now:AmazoniTunes
The Creature from the Bay
star
6.00
1 votes

#24 - The Creature from the Bay

Season 2 - Episode 10 - Aired 7/15/2015

Emma's younger brother catches a glimpse of her mermaid tail and thinks he's seen a sea monster -- soon the whole town is in an uproar.

Watch Now:iTunes
Robot Duel
star
4.00
1 votes

#25 - Robot Duel

Season 2 - Episode 9 - Aired 7/15/2015

Lewis is thrilled when the university hosts an underwater robot competition, but the girls fret over the safety of their marine friends.

Watch Now:iTunes

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