First Platoon centers around Rock Brannigan (Scott Gibson) and his ragtag squad of ex-military zombie hunters trying to make a living in the desert Southwest two years after the zombie apocalypse. Along the way, they encounter the grizzled Pa Jericho (Sid Haig), and the eccentric Rex Necro (Malcolm McDowell).
During the 2012 Summer Olympics in London, a virus was released which causes a zombie uprising which decimates humanity. In the year 2018, six years after civilization is destroyed and with few humans left, the King of the Zombies (Noel Fielding) organizes a music festival to keep the zombie horde entertained after the zombie apocalypse.
In 2020, a super-computer named Kronos commits genocide against humanity. In 2080, Andrew wanders a dystopian Earth controlled by machines. He meets a girl named Calia and they travel to a sanctuary named Aurora.