Legal ways to watch "The Flash" include watching it as it airs on the CW, or streaming episodes through Hulu. The first season of the show is also available on DVD and Blu-ray.
"The Flash" premiered on the CW on Oct. 7, 2014, to strong ratings and critical acclaim. As of Dec. 29, 2015, the show is airing its second season, with new episodes premiering Tuesdays at 8 p.m. Episodes are also available on Hulu with a subscription to the service, though certain episodes are available to stream with a free trial. In addition to "The Flash," Hulu features other shows that air on the CW, including "Arrow."