The controlled explosion of an atomic bomb in the Arctic Circle awakens a frozen dinosaur that will wreak havoc in New York City.

Paul Hubschmid
as Prof. Nesbitt

Paula Raymond
as Lee Hunter

Cecil Kellaway
as Prof. Elson

Kenneth Tobey
as Col. Evans

Donald Woods
as Capt. Jackson

Lee Van Cleef
as Corp. Stone

Steve Brodie
as Sgt. Loomis

Ross Elliott
as George Ritchie

Jack Pennick
as Jacob Bowman

Ray Hyke
as Sgt. Willistead
John Chard
Rhedosaurus rampage as Harryhausen genius starts to work. Nuclear testing out in the arctic rouses a prehistoric Rhedosaurs from its icy incarcerated sleep. It promptly lays waste to everything that gets in its path, and its next stop is New York City. The Beast from 20,000 Fathoms stands as o...