Gaines (Paterson Joseph) and Scotty (Kyle Soller) break Rhonda (Jenna Fischer) and Leanne (Megan Mullally) out of jail and fly them to Slough for the bunker. Meanwhile, newlyweds Dave (Joel Fry) and Paula (Pauline Quirke) rescue Jamie (Mathew Baynton) from the bank vault. As they all arrive at the bunker, the door is jammed. In order to successfully survive the apocalypse, someone has to make a painful sacrifice.