This is the first post war science fiction film made. 15 chapters. . this is chapter 4 .”THE LETHAL PIT.”. The Purple Monster is an alien from Mars, who crash lands on earth with his henchmen. A noted astronomer encounters them. Turning into a ghost, gases that kill instantly, mind control & booby trapped empty parking lots enable the Martian’s evil deeds. The quest for the astronomer’s spaceship design plans .is the Martian’s addiction. The Purple Monster wants a round trip deal. Return to Mars and back to Invade Earth !! Although the film is in black & white, the lobby card is a more Martian-like blue, black & white.. Available for sci-fi lovers only.This Purple Monster can assume the form of any human. Great original 1940’s sco-fi artwork. Hang this lobby card on your wall and it will turn into Martian Eye Candy.