Richard Basehart Adm. Harriman Nelson Actor David Hedison Cdr., Capt. Lee Crane Actor Robert Dowdell Lt. Cdr. Chip Morton Actor Del Monroe Kowalsky Actor Paul Trinka Crewman Patterson Actor Arch Whiting Crewman Sparks Actor Richard Bull Doctor Actor Henry Kulky Chief Petty Officer Curley Jones Actor Terry Becker Chief Sharkey Actor Allan Hunt Stu Riley Actor