While on leave, astronaut Bigfoot encounters Baphomet and is sent to Hell, where he meets Lucifer.

Apo, a directionless skateboarder with dreams of going pro, finds himself trapped in a shopping mall when entitled customers consuming "Ratartarre" (a rat poison marketed as a COVID cure) transform into ravenous "brain dead" zombies sporting Karen haircuts. Together with his best friend Jamal and his crush Cho from the Korean chicken restaurant, Apo discovers that the zombies have unusual weaknesses. As the army surrounds the mall with mysterious intentions, the trio must battle through hordes of brain deads screaming for "MANAGRRR" to find a way out before time runs out.