Marcus is introduced as a very rude passenger aboard Flight 462, demanding that the flight attendant tell him whether or not Flight 462 has been cancelled. He is later seen being sick into a bag, and his wife explains that he suffers from acid reflux. He then bolts for the toilets where he stays for some time, raising concerns over his well being. The flight staff, concerned for his well being, open the toilet to find he has died. They try desperately to revive him, but to no avail. He turns, however, and is shoved back into the toilet with the door locked behind him because the flight crew believe him to be violent and insane. He eventually stops struggling inside the toilet and his wife believes him to be okay. She opens the door and is attacked and bitten. Marcus is eventually put down by Alex.