

Following the discovery of a doomsday machine capable of destroying Earth, the launch of a US space mission to Venus is taken over by the military.
Practical Effects
Spaceship sets made of pure cardboard ambition.
Production
Three directors = three different movies stapled together.

Director
Lee Sholem
Trivia, insights & behind the scenes
The Venus footage was lifted wholesale from a 1968 Japanese film called 'Green Slime' — yes, really.
This was originally shot in 1967 as 'Doomsday' but sat shelved until 1972 when new scenes were crammed in to capitalize on environmental panic.