One of the most prominent moments in the entire show happened early on in the show's first season. In episode 6, titled "TS-19," Rick and the group find themselves seeking refuge and answers at headquarters for the CDC. However, when the doctor who let them inside threatens to blow the place up with all of them inside, Rick begs him for a chance to live, to survive. His wishes are granted and when he tells that doctor that he is grateful, the doctor responds with the infamous line, "The day will come when you won't be."