Cast[]
- Dot (Harvey Girls Forever!) as Ariel
- Arlo (Arlo the Alligator Boy) as Flounder
- Max (The Secret Life of Pets) as Sebastian
- Joe Gardner (Soul) as King Triton
- Amanda Waller (DC Superhero Girls) as Queen Athena
- Audrey (Harvey Girls Forever!) as Aquata
- Lotta (Harvey Girls Forever!) as Adella
- Lucretia (Harvey Girls Forever!) as Arista
- Zoe (Harvey Girls Forever!) as Alana
- Chevron (Harvey Girls Forever!) as Attina
- Frufru (Harvey Girls Forever!) as Andrina
- Captain Chantel DuBois (Madagascar 3: Europe's Most Wanted) as Marina Del Rey
- Hyenas (The Lion King) as Marina's Eels
- Oh (Home) as Benjamin
- Po (Kung Fu Panda) as Ray-Ray
- Nick Wilde (Zootopia) as Shelbow
- Verne (Over the Hedge) as Cheeks
- RJ (Over the Hedge) as Ink Spot
- Hammy (Over the Hedge) as Swifty
- Gerald (Harvey Girls Forever!) as Stevie (Adella's Love Interest)
- Young Dot (Harvey Girls Forever!) as Young Ariel
- Young Audrey, Young Lotta (Harvey Girls Forever!), Bonnie Anderson (Toy Story 3), Adelaide Chang (The Loud House/The Casagrandes) and Lola Loud (The Loud House) as Young Ariel's Sisters
- Tweety Bird (Looney Tunes) as Scuttle (silent cameo)
- Scar (The Lion King) and Makunga (Madagascar: Escape 2 Africa) as Two Swordfish Guards