S1·E1 Puppies and Kittens

Three years into the zombie apocalypse, a ragtag team of everyday heroes comes together to transport the only known survivor of the zombie virus from Upstate New York to a lab in California, in hopes of using his blood for a vaccine. A zombie baby proves to be an early obstacle, and what they don't know is that their last, best hope for a vaccine is hiding a dark secret that threatens them all.