Clark was a resident of Sevastopol Station. He originally owned a small business on board Sevastopol, but had to close it down due to the presence of large megacorporations that made his as well as other small businesses aboard Sevastopol difficult to run. He also mentioned having a wife and kids who moved out of Sevastopol prior to the Alien's presence on the station.
When a lone Xenomorph was unleashed on the station by the crew of the Anesidora in 2137, he became one of the survivors desperately waiting for rescue and was scavenging any remains he could find to survive. After witnessing his neighbor's death at the hands of the Alien, Clark claimed his deceased neighbor's gun and roamed around Sevastopol's halls to evade the Alien. After hearing incoming footsteps from the halls, Clark panics and backs himself against the wall. Fearing death at the hands of the Alien, he attempted to take his own life with his two remaining bullets, but changed his mind at the last minute and choose to shoot whatever was coming. He realized that the one he had shot is a Colonial Marshal, he regretted for what he had done, stating that he didn't mean to kill anyone and that it was an accident. Assuming the Marshal was dead, Clark decided to take the Marshal's weapons and move forward. As Clark was about to leave, he was relieved that the Marshal was still alive after hearing the Marshal's cry for help, however the Alien suddenly appears from behind. Clark choose to leave the Marshal behind and escaped via elevator, leaving the Marshal to be killed by the Alien.
As the elevator opens, Clark is confronted by the Working Joe synthetic, Chuck, who was waiting for him and told him that he shouldn't be there and then proceeded to attack him. Unable to fight back against the synthetic, Clark was strangled to death by Chuck.