DC's Legends of Tomorrow, or simply Legends of Tomorrow, is an American time travel superhero 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 and Fedak originally served as showrunners, while Keto Shimizu became co-showrunner with Klemmer starting with the fourth season. Wikipedia