I remember this older scifi movie where I think only 2 of the astronauts return alive from an expedition, but they bring back an entity that has mind control. One of the astronauts is immune to the mind control because he has a metal plate in his head, so he sets about to save the day.  Toward the end of the show, to show his complete control over humans, the entity (which is a large mass) has the immune astronaut’s best friend (and only other surviving member of the space expedition), walk into the entities mouth and goes crunch.  Eventually they save the day so humanity does not end up as snacks for the entity/monster.