Season one is about Rick Grimes as he tries to find his family and take them to safety. The series starts with Rick waking up from a coma. He awakes to a world overrun by the walking dead ("walkers"). Rick leaves the hospital. He goes to his home and learns that his wife and son are not there. Rick hears a rumour from a fellow survivor. He goes to the police station and gets weapons. He goes to Atlanta. He was told that the Centers for Disease Control and Prevention created a "safe-zone" in the city. He thinks this is where his family would have gone. During his travel, Rick sees the damage to both society and infrastructure caused by the disaster. When he gets to Atlanta, he sees that the city is overrun by the undead. It is no longer a safe zone.