Martin Balsam as Capt. Caleb Sark

Catherine Burns as Celeste Davillo

Chuck Connors as Brian DiPaulo

Donna Mills as Linda Daniel

Agnes Moorehead as Bronsky

Bart La Rue as Telephone Man

Eddie Egan as Lt. Costin

David Spielberg as Dr. Widdocomb

Peter Hooten as Chris Arden

John Karlen as Manning

John Martino as Steve Martin

Mary Grace Canfield as Charlady

Claude Johnson as Policeman