"TS-19" is the sixth episode and season finale of the first season of the post-apocalyptic horror television series, The Walking Dead. It originally aired on AMC in the United States on December 5, 2010. The episode was written by Adam Fierro and series creator Frank Darabont and directed by Guy Ferland. In the episode, the group finally finds safe haven in the Centers for Disease Control and Prevention headquarters, although the only scientist there, Dr.