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

Scott Tracy / Reactor Control Assistant (voice)

Virgil Tracy (voice)

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

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

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

Lady Penelope (voice)

Tin-Tin / Grandma (voice)