Scientists investigate a huge meteor that crashes into the ocean off Mexico, and encounter a skyscraper-tall, mobile machine which is designed to syphon energy from earth, including any energy directed at it in an effort to destroy it.

Jeff Morrow
as Dr. Leslie Gaskell

Barbara Lawrence
as Vera Hunter

George O'Hanlon
as Dr. Arnold Culver

John Emery
as Dr. Hubbell Eliot

Morris Ankrum
as Dr. Albert Stern

Kenneth Alton
as McCrary - The Pickup Driver

Jose Gonzales-Gonzales
as Manuel Ramirez

Robert Forrest
as KGTK-TV Newscaster

Baxter Ward
as Second Newscaster

John Halloran
as Lab Central Security Guard