When Josh Hershberg, a 20 year old introverted geek culture lover is diagnosed with terminal brain cancer, he believes he isn't special and has nothing to offer the world. However, on the day he decides to kill himself and end it all, a vessel carrying the first sample of liquid water discovered on Mars crashes to Earth on re-entry parking the Zombie Apocalypse.
One month later, the world has gone to hell and Josh has set off to wander through the madness alone. He stumbles upon his crush, her cousin and a wayward pizza party clown trying to find their way to safety. In the middle of a sudden Zombie attack, the three learn that Josh is immune to being a target of the undead due to his rare illness. Josh, using his comic-book/gaming/movie knowledge and engineering expertise crafts Zombie killing weapons and heroically saves the lives of his co-patriots earning him a place in their ragtag group.
In the process, Josh discovers, once and for all, you may not know what makes you special, but your time will come. And perhaps, when the biggest epic fail ever to happen to civilization triggers the rising of the dead to kill the living, one may find that there is a zombie assassin in all of us.