Arrowverse
In 2011, Kreisberg, Marc Guggenheim, and Greg Berlanti began developing Arrow, a re-imagining of the DC Comics comic book character Green Arrow for The CW. In January 2012, The CW picked the project up to pilot.[8] On January 31, 2012, actor Stephen Amell was cast in the title role of Oliver Queen/Arrow.[9] On May 11, 2012, The CW order Arrow to series. It premiered on October 10, 2012.[10]
In July 2013, it was announced that Kreisberg, fellow Arrow co-creator Berlanti and DC Comics CCO Geoff Johns would be introducing Barry Allen during the show's second season, with the twentieth episode serving as a backdoor pilot. Actor Grant Gustin was cast and first appeared in the eighth episode of the second season, "The Scientist".[11] The CW producers were pleased with the handling of the character, and greenlit a pilot episode, foregoing the backdoor version.[12] In May 2014, The Flash was officially ordered to series.[13] It premiered October 7, 2014.[14]
On February 26, 2015, it was announced that Kreisberg, along with Guggenheim and Berlanti, would write/executive produce a spin-off series featuring Caity Lotz, Victor Garber, Brandon Routh and Wentworth Miller as White Canary, Martin Stein, the Atom, and Captain Cold respectively, for a potential 2016 premiere.[15] The series, titled Legends of Tomorrow premiered on January 21, 2016.[16]