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. Season 1-3 were broadcast on Virgin 1 in the UK and Season 4 on Sky Living. In June 2022, all series became available on ITV Hub. Online distribution In an aggressive marketing campaign by NBC, the pilot episode was released across a broad range of media from satellite broadcasting to popular social networking websites such as Facebook, shown on United Airlines flights, freely distributed on video on demand on about 30 cable and satellite systems including Comcast, Time Warner Cable, Cox Communications and Dish Network, on Yahoo, and from Amazon Unbox. Also, prior to the airing of Chuck in the United Kingdom, the pilot episode was released as a free temporary download on iTunes. A full week before the second season's U.S. premiere, iTunes offered a free download of the first episode as a 'pre-air premiere'. This promotion was also available on the Xbox Live Marketplace.Chuck can also be seen on Virgin Media's On Demand service in association with Warner TV All episodes of Seasons 1 through 5 are available for purchase in the U.S. at the iTunes Store,