Peter Dyneley

Jeff Tracy / Professor Holden / 1st Reporter

Shane Rimmer

Scott Tracy / Reactor Control Assistant

David Holliday

Virgil Tracy

Ray Barrett

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

David Graham

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

Matt Zimmerman

Alan Tracy / Press Officer / 2nd Reporter

Sylvia Anderson

Lady Penelope

Christine Finn

Tin-Tin / Grandma