" Vatos " is the fourth episode of the first season of The Walking Dead, airing in 2010. It is a pivotal episode that balances intense tension in Atlanta with a sudden, devastating tragedy back at the survivors' camp. While Rick's group is occupied in the city, the campfire dinner back at the quarry turns into a bloodbath, and a horde of walkers descends on the camp. The episode emphasizes the danger of splitting the group and forces the characters to realize that not everyone is a monster.