DC's Legends of Tomorrow, or simply Legends of Tomorrow, is an American television series developed by Greg Berlanti, Marc Guggenheim, Andrew Kreisberg and Phil Klemmer, who are also executive producers along with Sarah Schechter and Chris Fedak; Klemmer serves as showrunner. The series airs on The CW and premiered on January 21, 2016. The show is a spin-off from Arrow and The Flash, existing in the same fictional universe.