Kayley (voice)

Jessalyn Gilsig

Acting

Kayley (singing voice)

Andrea Corr

Acting

Garrett (voice)

Cary Elwes

Acting

Garrett (singing voice)

Bryan White

Acting

Ruber (voice)

Gary Oldman

Acting

Devon (voice)

Eric Idle

Acting

Cornwall (voice)

Don Rickles

Acting

Juliana (voice)

Jane Seymour

Acting

Juliana (singing voice)

Céline Dion

Acting

King Arthur (voice)

Pierce Brosnan

Acting

King Arthur (singing voice)

Steve Perry

Acting

Grifin (voice)

Bronson Pinchot

Acting

Bladebeak (voice)

Jaleel White

Acting

Lionel (voice)

Gabriel Byrne

Acting

Merlin (voice)

John Gielgud

Acting

Ayden (voice)

Frank Welker

Acting

Additional Voices (voice)

Jack Angel

Acting

Young Kayley (voice)

Sarah Freeman

Acting

Additional Voices (voice)

Sherry Lynn

Acting

Additional Voices (voice)

Mickie McGowan

Acting

Singing Voice (voice) (uncredited)

Linda Harmon

Acting