Cast[]
- Chloe Carmichael (Mermaid, The Fairly OddParents) as Ariel (Mermaid)
- Chloe Carmichael (Human, The Fairly OddParents) as Ariel (Human)
- Timmy Turner (The Fairly OddParents) as Eric
- Goldie Locks (Goldie and Bear) as Melody
- King Neptuna (The Fairly OddParents) as King Triton
- Puppy Krypto (Krypto the Superdog) as Young Flounder
- Krypto (Krypto the Superdog) as Adult Flounder
- Gumball, Darwin and Anais (sharing the role) (The Amazing World of Gumball) as Sebastian
- Zazu (The Lion King) as Scuttle
- Shego (Kim Possible) as Morgana
- Brutus and Nero (The Rescuers) as Cloak and Dagger
- Hopper (A Bug's Life) as Undertow (large size)
- Molt (A Bug's Life) as Undertow (small size)
- Spike (My Little Pony: Friendship is Magic) as Tip
- Discord (My Little Pony: Friendship is Magic) as Dash
- Danny Fenton/Danny Phantom (Danny Phantom) as Grimsby
- Sophie Sanders (Bunsen is a Beast!) as Carlotta
- Chef Skinner (Ratatouille) as Chef Louis
- Sparky (The Fairly OddParents) as Max the Sheepdog