Characters played by Arthur Franz
Professor Donald Blake
Characters played by Joanna Moore
Madeline Howard
Characters played by Judson Pratt
Police Lt. Mike Stevens
Characters played by Nancy Walters
Sylvia Lockwood
Characters played by Troy Donahue
Jimmy Flanders
Characters played by Phil Harvey
Police Sgt. Powell
Characters played by Helen Westcott
Nurse Molly Riordan
Characters played by Alexander Lockwood
Professor Gilbert Howard
Characters played by Whit Bissell
Dr. Oliver Cole
Characters played by Ross Elliott
Police Sgt. Eddie Daniels
Characters played by Anne Anderson
Student
Characters played by Louis Cavalier
Student
Characters played by Richard H. Cutting
Tom Edwards - Forest Ranger
Characters played by Eddie Parker
Donald as a Monster
Characters played by Hank Patterson
Townsend - Night Watchman
Characters played by Ronnie Rondell Jr.
Student