Peter Dyneley

Jeff Tracy / Professor Heinz Bodman (voice)

Shane Rimmer

Scott Tracy (voice)

David Holliday

Virgil Tracy (voice)

Matt Zimmerman

Alan Tracy / TV Reporter (voice)

David Graham

Gordon Tracy / John Tracy / Brains / Kyrano (voice)

Christine Finn

Tin-Tin Kyrano / Grandma Tracy (voice)

Jeremy Wilkin

Virgil Tracy / Operator Power / Tom (voice)

Ray Barrett

Colonel Harris / Colonel Benson / Rick O’Shea (voice)

Charles Tingwell

International Space Control Commander (voice)

Sylvia Anderson

Professor Marshall (voice)