Richard Long as Jerry Carter

Polly Bergen as Sylvia Carter

Edward Albert as James Radney

Kate Jackson as Mary Frances Radney

Celeste Holm as Elizabeth Mason

Tom Bosley as David Mason

Michael Constantine as Dr. Burke

Cesare Danova as Captain Vettori

Amzie Strickland as Lynn

Alain Patrick as Barrere

Maurice Sherbanee as Room Steward

Wesley Gale as Hotel Clerk (as West Gale)

Marc de Vries as Deck Steward