Peter Dyneley

Jeff Tracy / Professor Holden / 1st Reporter (voice)

Shane Rimmer

Scott Tracy / Reactor Control Assistant (voice)

David Holliday

Virgil Tracy (voice)

Ray Barrett

John Tracy / The Hood / Reactor Controller Wade / General Speyer / Fire Chief / Guard (voice)

David Graham

Gordon Tracy / Brains / Parker / Kyrano / Reactor Controller Collins / Plant Tour Guide (voice)

Matt Zimmerman

Alan Tracy / Press Officer / 2nd Reporter (voice)

Sylvia Anderson

Lady Penelope (voice)

Christine Finn

Tin-Tin / Grandma (voice)