text: Broadcast history The first showing of the pilot occurred on July 27, 2007, at Comic-Con International in San Diego. The series was originally slated to air on Tuesday nights at 9/8c as announced at the 2007 upfronts but this was later changed to Monday nights at 8/7c as announced during the 2007 Television Critics Association summer press tour. The season premiere aired on September 24, 2007, on NBC. The pilot was leaked onto torrent websites on July 22, 2007. All thirteen episodes produced before the 2007 Writers Guild of America strike have aired. The last two episodes of the original thirteen aired on January 24, 2008, with episode 12 airing at 8/7c and episode 13 at 10/9c, three days after they aired in Canada.
  Despite receiving a full season pickup, the first season contained only thirteen episodes; production was stalled due to the 2007–2008 Writers Guild of America strike.
  Season Two premiered on September 29, 2008. While the series originally had a 13 episode order, NBC ordered another nine, ensuring the series would get the full 22-episode treatment. The theme song is "Short Skirt/Long Jacket" by Cake.
  On February 2, 2009, Chuck broadcast a full-length 3D television episode. The episode was broadcast using the ColorCode 3-D stereoscopy system, and could be viewed by wearing a pair of glasses distributed as part of a national promotion for the movie "Monsters Vs. Aliens", which was sponsored by Intel.
  Season 4 appeared on the fall lineup and later received an order for 11 additional episodes on October 18, 2010.
  In the United Kingdom, season 1-3 were broadcast on Virgin 1 and Season 4 on Sky Living. In June 2022, all seasons became available on ITV Hub.