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)

David Elliott

David Lane

Desmond Saunders