Unidentified life forms are on your ship and you and your crewmates have to find a way to survive. There are unidentified life forms aboard that are trying to take over the ship, but it's falling apart and you can’t find the parts you need. Someone amongst your crew has it out for you. Whatever may happen, you have to get the ship fixed up to be able to get back to Earth. Nemesis is a semi-cooperative game where you all work towards the same goal from the get-go, but be wary of the Intruders and anyone in your crew that has a different agenda.