 " 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. Edwin Jenner ( Noah Emmerich ) hides many secrets that leads the group to demand answers about the zombie apocalypse . 
