Traitors in Space

You are a brilliant young scientist who has been chosen for a research mission to a distant planet. On your way back to Earth, you are woken early from cryosleep by the ship's computer. It has detected an alien life form, but there doesn't seem to be any sign of one. You look at your fellow crewmates and wonder if one of them has been taken over by an alien intelligence. Can you work out who can be trusted...? 9+