Reparto
Frank Mayo
Quentin Mitchell
Coulter Irwin
Frank, Willard's aide
Jim Bannon
Jack Packard
Thomas E. Jackson
Det. Capt. Quinn
Frank Wilcox
Prof. Arthur Logan
Barton Yarborough
Doc Long
Paul E. Burns
Leon Hartman
Mona Barrie
Louise Mitchell
Edward Earle
E. R. Willard
Michael Duane
Rex Kennedy
Mary Newton
Nurse
Harry Strang
Brophy, museum watchman
Anita Louise
Janet Mitchell
Richard Hale
Curator Raymond Halliday
Ludwig Donath
Dr. Karger
John Elliott
John, butler