Peter Dyneley
Jeff Tracy (voice)
Shane Rimmer
Scott Tracy (voice)
David Holliday
Virgil Tracy (voice)
Jeremy Wilkin
Virgil Tracy / Cravitz (voice)
Matt Zimmerman
Alan Tracy / Ned Cook (voice)
David Graham
Brains / Gordon Tracy / Aloysius Parker / Kyrano / Joe / Clayton / 2nd Site Control Policeman (voice)
Sylvia Anderson
Lady Penelope (voice)
Christine Finn
Tin-Tin Kyrano (voice)
Ray Barrett
John Tracy / U.S.N. Sentinel Commander / Compère / 1st Site Control Policeman (voice)
?
John Tate
Frank Hooper / Sir Harry (voice)