Arthur Franz

Donald Blake

Joanna Moore

Madeline Howard

Judson Pratt

Lt. Mike Stevens

Troy Donahue

Jimmy Flanders

Nancy Walters

Sylvia Lockwood

Helen Westcott

Nurse Molly Riordan

Ross Elliott

Sgt. Eddie Daniels

Alexander Lockwood

Prof. Gilbert Howard

Whit Bissell

Dr. Oliver Cole

Richard H. Cutting

Tom Edwards - Forest Ranger

Hank Patterson

Townsend - Night Watchman

Phil Harvey

Sgt. Powell

Eddie Parker

Donald as a Monster

Ronnie Rondell Jr.

Student

Anne Anderson

Student

Jack Arnold