I'm trying to remember a sci-fi movie featuring an Octopus type alien, possibly purple, stalking the crew of a spaceship. I only remember one scene. The creature was very slow, had one eye and I think it was acidic, and possibly 6 or 7 ft tall. I remember the crew uniforms were basically white. The film was featured once on Super Scary Saturday on TBS in the late 80s. I always assumed it was a movie from the '60s, or maybe it could be '70s. I think they had star-trek-type phasers. The monster thing basically couldn't be killed but I don't remember how the movie ended, except I believe only one or two people survive. I believe the crew had some sort of plan but were getting killed too quickly. The main character I remember resembled the first guy to die in Alien. But in this film he is the medic.
It might be The Green Slime, which came out in 1968.
The white suited crew of a space station orbiting earth encounters an alien race that grow out of a green, gooey substance, with several tentacles and a single eye in the center of their forehead. They seemed to feed off of energy, so the crew's phaser-like weapons only seem to make the aliens more powerful. Their tentacles immediately electrocute anybody they come in contact with, and the ship is completely infested with the creatures within a matter of days. The crew formulates a plan to lead all of the creatures into a single section of the station and then blow it up, but the aliens regenerate too quickly and the plan fails.
At the end, the remaining crew completely abandons the station allowing it to self destruct, with the final scene being the two heroes reconciling their differences as they attempt to decide who will stay behind on the station to activate the detonator.
Could it be Dragon's Domain, a Space: 1999 episode? The original air date is 23 October 1975.
It features an octopus-like monster with a single brilliant eye, nearly unkillable, that ate people and spat out corroded corpses.
The Alphans' uniforms are white, and they wield handheld lasers.
I distinctly remember watching the scariest scenes from under a blanket :-)