John Armstrong

Steve Armstrong (voice)

Clifford Harrington

Mark Gordon / Commander Robinson / Narrator / Additional Voices (voice)

Richard Murphy

Big Bert Armstrong (voice)

Nancy Culluci

Little John / Additional Voices (voice)

Gerri Sorrells

Jamie Robinson (voice)

William Ross

Dr Smith / Draco / Additional Voices (voice)

Don Johnson

Dr Ned Armstrong (voice)

Judith Sackheim

Dr Mary Ann Armstrong (voice)

Joseph Zucatti

Dr Hook / Additional Voices (voice)

Greg Starr

General Watson / Additional Voices (voice)