What really happened during that demonic invasion on mars? Nobody knows except John Grimm. John was just another member of the RRTS. His code name was Reaper. He had his "friends", the other members of the RRTS. Sarge, Duke, Mac, Portman, Goat, Destroyer, The Kid, and Reaper were waiting to go home. But that had changed when they where called to go on an unexpected mission to Oldivi, the UAC base on mars.
They grabbed their weapons and headed to the arc, the only way to Oldivi. On the way Sarge had shown them the video of Dr. Carmack "This is Dr. Carmack id 415530 I request help immediately we've had a level 5 breach I repeat send help NOW!!!" end of transmission. Sarge then said, "The mission is to stop the breach and put the arc under quarantine. Lets move!!!" they went and had put the elevator under quarantine. Then went to Oldivi through the arc.
They went through the airlock after meeting pinky. Pinky only had his top half of his body which was on top of a wheelchair type of device. The other half was spliced after his first ride through the arc. They had brought along reaper's sister Samantha because she had to collect Dr. Carmack's work. See next chapter to continue story