Legends of Tomorrow is an American action-adventure 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 is a spin-off from Arrow and The Flash, existing in the same fictional universe. On April 2, 2018, The CW renewed the series for a fourth season, which premiered on October 22, 2018. On January 31, 2019, The CW renewed the series for a fifth season, which is set to premiere in January 2020. As of May 20, 2019, 67 episodes of Legends of Tomorrow have aired, concluding the fourth season.