 Jessalyn GilsigKayley (voice) | Kayley (voice) |
 Andrea CorrKayley (singing voice) | Kayley (singing voice) |
 Cary ElwesGarrett (voice) | Garrett (voice) |
| BBryan WhiteGarrett (singing voice) | Garrett (singing voice) |
 Gary OldmanRuber (voice) | Ruber (voice) |
 Eric IdleDevon (voice) | Devon (voice) |
 Don RicklesCornwall (voice) | Cornwall (voice) |
 Jane SeymourJuliana (voice) | Juliana (voice) |
 Céline DionJuliana (singing voice) | Juliana (singing voice) |
 Pierce BrosnanKing Arthur (voice) | King Arthur (voice) |
 Steve PerryKing Arthur (singing voice) | King Arthur (singing voice) |
 Bronson PinchotGrifin (voice) | Grifin (voice) |
 Jaleel WhiteBladebeak (voice) | Bladebeak (voice) |
 Gabriel ByrneLionel (voice) | Lionel (voice) |
 John GielgudMerlin (voice) | Merlin (voice) |
 Frank WelkerAyden (voice) | Ayden (voice) |
 Jack AngelAdditional Voices (voice) | Additional Voices (voice) |
| SSarah RayneYoung Kayley (voice) | Young Kayley (voice) |
 Sherry LynnAdditional Voices (voice) | Additional Voices (voice) |
 Mickie McGowanAdditional Voices (voice) | Additional Voices (voice) |
| LLinda HarmonSinging Voice (voice) (uncredited) | Singing Voice (voice) (uncredited) |
