Help me find this TV show/movie from the 90s
All I can remember of it is the ending but I'll try to set up the context for what I can guess from the other parts.
It takes place on a moon or planet. The group there seem to be a bunch of scientists, but unsure what they're doing. An organism or phantom from the planet begins to take over the different people and they start to change, becoming something other and killing one another, though they don't seem to change appearances.
The only scene I really remember is the very end, where a man is banging against the door asking for the woman inside to let him in. I seem to recall him having a smirk on his face. They could have been partners. She slumps down against the bunker door, sobbing, knowing there's no way out. The movie feels very red (color) in my mind, almost as if it's taken place on Mars.
Unfortunately that's it. But this image has stuck with me for 30 years and it's killing me.
Might be a usa or syfy still of movie. Could be an outer limits kind of show. I really have no idea. Appreciate any help!