Peter Dyneley

Jeff Tracy / Lord Worden (voice)

Shane Rimmer

Scott Tracy (voice)

David Holliday

Virgil Tracy (voice)

Matt Zimmerman

Alan Tracy / Lieutenant Jensen (voice)

David Graham

Gordon Tracy / Parker / Brains / Kyrano / No. 2, Ocean Pioneer II / Collins (voice)

Ray Barrett

John Tracy / Captain Johnson / Sir Arthur / TV Reporter / Pioneer Base, Port London (voice)

Sylvia Anderson

Lady Penelope Creighton-Ward (voice)

Christine Finn

Tin-Tin Kyrano (voice)