Wyatt has been riding out the zombie apocalypse on his crew’s cobbled-together train for what feels like forever. It’s a hopeless journey, the train running a loop that covers thousands of miles across the western U.S.

But when a mysterious girl arrives with stories of a so-called Nirvana and a potential cure for the zombie parasite, Wyatt must decide between searching for the cure and protecting those entrusted in his care.