The Green Slime was released in May of 1969 and was a joint venture filmed in Japan with a big cast of American B-movie stars and a B-movie plot.
A giant asteroid on collision with Earth, a team of astronauts is sent from the nearby Gamma 3 space station to plant explosives and blow it up. Although the mission is successful, they unwittingly return to the space station contaminated with an alien goo which then mutates into deadly full sized space aliens. One eyed, tentacled and murderous, a battle for survival soon commences in lovely over saturated 60’s Technicolor.
Released at the very end of the previous year, the Japanese edit was known as Gamma 3: Operation Outer Space.