 Auliʻi CravalhoAriel | Ariel |
 ShaggySebastian | Sebastian |
 Graham PhillipsPrince Eric | Prince Eric |
 Amber Riley"Daughters of Triton" Emcee | "Daughters of Triton" Emcee |
 John StamosChef Louis | Chef Louis |
 Queen LatifahUrsula | Ursula |
 Jodi BensonSelf - Host / Ariel / Vanessa (voice) | Self - Host / Ariel / Vanessa (voice) |
 René AuberjonoisLouis (archive footage) (voice) | Louis (archive footage) (voice) |
 Christopher Daniel BarnesPrince Eric (archive footage) (voice) | Prince Eric (archive footage) (voice) |
 Pat CarrollUrsula (archive footage) (voice) | Ursula (archive footage) (voice) |
 Paddi EdwardsFlotsam and Jetsam (archive footage) (voice) | Flotsam and Jetsam (archive footage) (voice) |
 Buddy HackettScuttle (archive footage) (voice) | Scuttle (archive footage) (voice) |
 Jason MarinFlounder (archive footage) (voice) | Flounder (archive footage) (voice) |
 Kenneth MarsKing Triton (archive footage) (voice) | King Triton (archive footage) (voice) |
 Edie McClurgCarlotta (archive footage) (voice) | Carlotta (archive footage) (voice) |
 Will RyanHerald (archive footage) (voice) | Herald (archive footage) (voice) |
 Frank WelkerMax (archive footage) (voice) | Max (archive footage) (voice) |
 Ben WrightGrimsby (archive footage) (voice) | Grimsby (archive footage) (voice) |
 Samuel E. WrightSebastian (archive footage) (voice) | Sebastian (archive footage) (voice) |
 Jessica RotterChorus (voice) | Chorus (voice) |
 Leah AllersChorus (voice) | Chorus (voice) |
| AAlvin CheaChorus (voice) | Chorus (voice) |
 Allie FederChorus (voice) | Chorus (voice) |
| JJames HaydenChorus (voice) | Chorus (voice) |
| BBaraka MayChorus (voice) | Chorus (voice) |
| JJamal MooreChorus (voice) | Chorus (voice) |
| HHolly SedillosChorus (voice) | Chorus (voice) |
 Fletcher SheridanChorus (voice) | Chorus (voice) |
| SStephen Van DornChorus (voice) | Chorus (voice) |
 Laura DickinsonChorus (voice) | Chorus (voice) |
