Gary, Simon and Alisa - three friends who haven't seen each other in years - have reunited for a game night. Unfortunately, game night turns into them being transported against their will inside Team Fortress II - a popular, cartoon-world shoot-em'-up where blood, gore and death are the main currency. Oh, and hats. With Alisa captured, Gary and Simon must join forces with a group of other "normies" - people have who have been sucked into the game - to try and rescue her and maybe, just maybe, get back to their regular lives.