Zombie Apocalypse 10 p.m., Discovery Channel
When the world ends on Friday, I hope the Discovery Channel wins a Pulitzer in heaven for its coverage. Discovery has been all over this baby. This special looks at four people who have formed the Kansas Anti-Zombie Militia and are preparing for mass death by the walking dead. One of them is a mother teaching her children how to kill zombies. Also in the mix: medical and scientific experts who believe that a virus causing zombie-like symptoms is possible.