With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.
as Wright Thompson, Jr.
as Dr. Max A. Bauer
as Andrew "Andy" Ostergaard
as Dr. James Paxton
as Dr. George Coleman
as Carlisle Foundation Chairman
as Dr. Joan Lindsey
as Dr. Jeremiah Morley (uncredited)
