Richard Garland

Dale Drewer

Pamela Duncan

Dr. Martha 'Marti' Hunter

Russell Johnson

Hank Chapman

Leslie Bradley

Dr. Karl Weigand

Mel Welles

Jules Deveroux

Richard H. Cutting

Dr. James Carson

Beach Dickerson

Seaman Ron Fellows

Tony Miller

Seaman Jack Sommers

Ed Nelson

Ensign Quinlan

Charles B. Griffith

Seaman Mac, wears sunglasses

Maitland Stuart

Diving-double for male cast

Robin Riley

Diving-double for Pamela Duncan

Roger Corman