Mark Vincent was an inmate on the prison planet Fiorina 161 who was mortally wounded by the an explosion, during the prisoners attempt to trap the alien in nuclear waste containment rooms, which killed 5 other prisoners. the others could not find him and Dillon presumed him dead. the alien later found him, while the other inmates attempted to try and trap the Alien in the leadworks, and killed him. His scream was heard by Kevin, who found the alien killing him and started the "bait and chase" plan. His body was later found by David, telling the others that he finally found him.
The role is not listed in the film's credits, as Vincent is primarily an extra who is killed in the bait and chase sequence.
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