Doomsday Machine, The (1972)
NOTE: This is NOT the Cinematic Titanic version.
Starring: Grant Williams
Plot: Spies discover that the Red Chinese have built a "doomsday machine" capable of destroying the surface of the Earth, and that they plan to use it within a matter of days. Meanwhile, Project Astra, a manned U.S. space mission to Venus, is in its final hours before launch. Is the human race doomed? What dangers and wonders await the crew of the Astra on their journey to Venus?