The Diesel Brothers look back on past builds and reveal what's coming up in the new season starting tonight, then they debate which build would be the best defense in case of an apocalypse. They also chat with guests Michael Cudlitz ("The Walking Dead"), Wes Harper ("Naked and Afraid XL") and Marty Raney ("Homestead Rescue"), among others, in "Diesel Nation vs. Zombie Apocalypse."