Impostor Hide

There is an impostor hiding somewhere on this ship! While he is on board, the rest of the crew is in danger because his goal is to kill everyone - either by driving a knife into their backs or breaking one of the ship's crucial systems. Now the goal of the astronauts is to reveal the true identity of the killer and make sure they can never hurt any of the crew members again. The impostor, for his part, has to proceed with their dark agenda no matter what. Who is going to win?