Jessalyn Gilsig

Kayley (voice)

Andrea Corr

Kayley (singing voice)

Cary Elwes

Garrett (voice)

Bryan White

Garrett (singing voice)

Gary Oldman

Ruber (voice)

Eric Idle

Devon (voice)

Don Rickles

Cornwall (voice)

Jane Seymour

Juliana (voice)

Céline Dion

Juliana (singing voice)

Pierce Brosnan

King Arthur (voice)

Steve Perry

King Arthur (singing voice)

Bronson Pinchot

Grifin (voice)

Jaleel White

Bladebeak (voice)

Gabriel Byrne

Lionel (voice)

John Gielgud

Merlin (voice)

Frank Welker

Ayden (voice)

Jack Angel

Additional Voices (voice)

Sarah Freeman

Young Kayley (voice)

Sherry Lynn

Additional Voices (voice)

Mickie McGowan

Additional Voices (voice)

Linda Harmon

Singing Voice (voice) (uncredited)