Robert Conrad

as Cmdr. Mark Van Meer

David Soul

as Capt. Kevin Harris

Sam Waterston

as Capt. Allard Renslow

Richard Roundtree

as Cmdr. Frederick Bryce

Jonathan Banks

as Ray Olson

Art LaFleur

as 'Animal' Meslinsky

Dennis Holahan

as Warden

Sergio Fantoni

as Pietro

Yvette Mimieux

as Cheryl Leary

Ed Bishop

as Adm. Stewart Cullinane

Virginia Bryant

as Nurse

John Leamer

as Glenn Dayley