Overview
With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.
Cast
- Bruce Kellogg as Wright Thompson, Jr.
- Otto Waldis as Dr. Max A. Bauer
- Jim Bannon as Andrew "Andy" Ostergaard
- Tom Handley as Dr. James Paxton
- Dick Cogan as Dr. George Coleman
- George Baxter as Carlisle Foundation Chairman
- Marilyn Nash as Dr. Joan Lindsey
- Victor Kilian as Dr. Jeremiah Morley (uncredited)