Blue doom marine

You (the Doom guy) have been missing for a few months since you and your team arrived at the hanger base on Mars. The UAC on Earth sent another marine to see if you and your team is still alive, turns out you're the only one alive. You've going through killing demons in the hanger base to avenge your dead team and then you and the blue marine come face to face. What will you do next, you choose your own adventure.