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Unknown World (1951)

Genres: Adventure, Science Fiction

With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.

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)