Bettina Bush

as Rainbow Brite (voice) (as Bettina)

Pat Fraley

as Lurky / On-X / Buddy Blue / Dog / Guard / Spectran / Slurthie / Glitterbot (voice) (as Patrick Fraley)

Peter Cullen

as Murky Dismal / Castle Monster / Glitterbot / Guard / Skydancer / Slurthie (voice)

Robbie Lee

as Twink / Shy Violet / Indigo / La La Orange / Spectran / Sprites (voice)

Andre Stojka

as Starlite / Wizard / Spectran (voice)

David Mendenhall

as Krys (voice)

Rhonda Aldrich

as The Princess / The Creature (voice)

Les Tremayne

as Orin / Bombo / TV announcer (voice)

Mona Marshall

as Red Butler / Witch / Spectran / Castle Creature / Patty O'Green / Canary Yellow (voice)

Jonathan Harris

as Count Blogg (voice)

Marissa Mendenhall

as Stormy (voice)

Scott Menville

as Brian (voice)

Charlie Adler

as Popo (voice)

David Workman

as Sargeant Zombo (voice)