"Sick" is the second episode of the third season of the post-apocalyptic horror television series The Walking Dead, which aired on AMC in the United States on October 21, 2012.

The third season of The Walking Dead, an American post-apocalyptic horror television series on AMC, premiered on October 14, 2012, and concluded on March 31, 2013, consisting of 16 episodes. Developed for television by Frank Darabont, the series is based on the eponymous series of comic books by Robert Kirkman, Tony Moore, and Charlie Adlard. It was executive produced by Kirkman, Glen Mazzara, David Alpert, and Gale Anne Hurd, with Mazzara as showrunner for his second and final season. The third season was very well received by critics. It was nominated for multiple awards and won two, including Best Syndicated/Cable Television Series, at the 39th Saturn Awards.