Donald Blake
Arthur Franz
Madeline Howard
Joanna Moore
Townsend - Night Watchman
Hank Patterson
Sgt. Powell
Phil Harvey
Donald as a Monster
Eddie Parker
Student
Ronnie Rondell Jr.
Anne Anderson
Lt. Mike Stevens
Judson Pratt
Jimmy Flanders
Troy Donahue
Sylvia Lockwood
Nancy Walters
Nurse Molly Riordan
Helen Westcott
Sgt. Eddie Daniels
Ross Elliott
Prof. Gilbert Howard
Alexander Lockwood
Dr. Oliver Cole
Whit Bissell
Tom Edwards - Forest Ranger
Richard H. Cutting
Makeup Artist
Bud Westmore
Director
Jack Arnold
Producer
Joseph Gershenson
Writer
David Duncan
Art Direction
Alexander Golitzen
Director of Photography
Russell Metty
Editor
Ted J. Kent
Creature Design
Jack Kevan
Visual Effects
Clifford Stine