Jack Packard

Janet Mitchell

Rex Kennedy

Doc Long

Leon Hartman

Det. Capt. Quinn

Louise Mitchell

Prof. Arthur Logan

Curator Raymond Halliday

Dr. Karger

Nurse

E. R. Willard

Senor Mendoza

John, butler

Quentin Mitchell

Introductory Narrator (voice)

Frank, Willard's aide

Closing-Time Museum Guard

Brophy, museum watchman