Arrowverse

An unnamed shared universe, often referred to as the Arrowverse, is a television franchise that is based on characters that appear in publications by DC Comics. The show's shared universe is akin to the DC universe in their comic books, which has had crossover plot elements, settings and characters.

History
The CW began airing Arrow in fall 2012. Due to its success, the network began production for a The Flash spin-off the following year. Barry Allen was planned to be introduced in the eighth and ninth episodes of the show's second season, followed by the twentieth episode acting as a backdoor pilot. However, after executives saw the initial episodes, they decided to order the series straight to pilot. In early 2015, the CW announced a web-series for Vixen to air on the CW Seed. . Two months later, The CW announced an additional series, Legends of Tomorrow to air early 2016.

Television series

 * Arrow (2012–present)
 * The Flash (2014–present)
 * DC's Legends of Tomorrow (2016)

Web series

 * Blood Rush (2013)
 * Vixen (2015)

Comic book series

 * Arrow (2012–2013)
 * Arrow: Season 2.5 (2014–2015)
 * The Flash: Season Zero (2014–2015)