Characters played by Boris Karloff
Dr. Laurience
Dick Haslewood
Characters played by John Loder
Dick Haslewood
Dr. Laurience
Characters played by Anna Lee
Dr. Clare Wyatt
Characters played by Frank Cellier
Lord Haslewood
Clayton
Characters played by Donald Calthrop
Clayton
Lord Haslewood
Characters played by Cecil Parker
Dr. Gratton
Characters played by Lyn Harding
Prof. Holloway