Jonathan Harris

Dr. Zachary Smith (voice)

Sherry Alberoni

Deanna Carmichael (voice)

Michael Bell

Craig Robinson (voice)

Don Messick

The Robot / Brack / Narrator (voice)

Vincent Van Patten

Linc Robinson (voice)

Sidney Miller

Lar / Tyrano Twin One (voice)

Ralph James

Tyrano Twin Two (voice)