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I was young and I only seen it twice but never knew its name? It's a group of people in space and there was a guy who was an undercover detective who was looking for a killer on the ship. It had like "Leviathan" thing where the creature was eating the crew. One scene I remember was the girl in the shower and she felt sick. She was laying in bed, then the creature came in and ripped her body open and ate another crew member who try to help her. The ending was with a guy (the suspect who was lock in the storage room) and a girl. They escape the ship after blowing it up. The detective had the creature inside him and was hiding in the lifeboat where the two were and try to kill them both and go back to earth with the thing inside him, but the guy (suspect) got him off the ship and a little piece of the creature got into the girl and I think the guy killed her, but not sure. It was an old anime movie like in the 80's but I can't remember the title. Can anyone help me?