The controlled explosion of an atomic bomb in the Arctic Circle awakens a frozen dinosaur that will wreak havoc in New York City.
| Actor | Role |
|---|---|
 Paul HubschmidProf. Nesbitt | Prof. Nesbitt |
 Paula RaymondLee Hunter | Lee Hunter |
 Cecil KellawayProf. Elson | Prof. Elson |
 Kenneth TobeyCol. Evans | Col. Evans |
 Donald WoodsCapt. Jackson | Capt. Jackson |
 Lee Van CleefCorp. Stone | Corp. Stone |
 Steve BrodieSgt. Loomis | Sgt. Loomis |
 Ross ElliottGeorge Ritchie | George Ritchie |
 Jack PennickJacob Bowman | Jacob Bowman |
 Ray HykeSgt. Willistead | Sgt. Willistead |
 Paula HillMiss Ryan | Miss Ryan |
 Michael FoxER Doctor | ER Doctor |
| AAlvin GreenmanRadar Man #1 | Radar Man #1 |
 Frank FergusonDr. Morton | Dr. Morton |
 King DonovanDr. Ingersoll | Dr. Ingersoll |