Chain Reaction is an American game show created by Bob Stewart, in which players compete to form chains composed of two-word phrases. The show aired three separate runs: Bill Cullen hosted the original series on NBC from January 14 to June 20, 1980. The second version aired on the USA Network from September 29, 1986 to December 27, 1991 and was hosted first by Blake Emmons and later by Geoff Edwards. Another version, hosted by Dylan Lane, premiered on August 1, 2006 on GSN. This version aired its final original episode on June 9, 2007 but has continued to air in reruns since, currently airing Mondays through Fridays at 3:00 PM and 3:30 PM ET on GSN. Starting August 2, 2013, it will air Fridays at 8:00 PM to 10:00 PM on GSN.