Chuck is an American spy action-comedy-drama television series created by Josh Schwartz and Chris Fedak. It premiered on the terrestrial television network NBC on September 24, 2007, airing on Mondays at 8:00 pm ET. Chuck centers on Chuck Bartowski, an "average computer-whiz-next-door", who receives an encoded e-mail from an old college friend now working in the CIA; the message embeds the only remaining copy of the world's greatest spy secrets into Chuck's brain. The first season of Chuck aired in 2007–08, containing 13 episodes. After the 2007–08 Writers Guild of America strike, NBC renewed Chuck for a second season instead of extending the first to a full season of 22 episodes. The full-length second season originally aired in 2008–09. Episodes of Chuck are also available in various new media formats. The first through fifth seasons are available to purchase on DVD and Blu-ray. In the United States, United Kingdom and Canada, every episode is available for download from iTunes. Episode titles for Chuck are consistently formatted as "Chuck Versus...". For example, the pilot episode is titled "Chuck Versus the Intersect". This list is ordered by the episodes' original air date and not by the production codes, which show the order in which episodes were filmed.