The fourth season of the American television series Legends of Tomorrow, which is based on characters from DC Comics, premiered on The CW on October 22, 2018, and concluded on May 20, 2019, with a total of 16 episodes. The season follows the Legends, a dysfunctional team of time-traveling superheroes and anti-heroes, and their mission to recapture the magical fugitives that they accidentally released throughout time. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow and The Flash. The season was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Phil Klemmer and Keto Shimizu serving as showrunners.
The season was ordered in April 2018, and production began that July. Principal cast members Brandon Routh, Caity Lotz, Maisie Richardson-Sellers, Tala Ashe, Amy Louise Pemberton, Nick Zano, and Dominic Purcell return from previous seasons, while Jes Macallan, Matt Ryan and Courtney Ford were promoted to the principal cast from their recurring statuses in season three. They are joined by new cast member Ramona Young. The series was renewed for a fifth season on January 31, 2019.
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