The sixth season of the American television series Legends of Tomorrow, which is based on characters from DC Comics, premiered on The CW on May 2, 2021, and consisted of 15 episodes.

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.

Principal cast members Caity Lotz, Tala Ashe, Jes Macallan, Olivia Swann, Amy Louise Pemberton, Nick Zano, Dominic Purcell and Matt Ryan return from previous seasons, while Adam Tsekhman and Shayan Sobhian were promoted to the main cast from their recurring status in previous seasons.

He added, "To think about little green men with laser guns who just want to rule the world, you know, Marvin the Martian kinda shape, you're like, "Yes, that's what we need!"

[27] Main cast members Caity Lotz, Tala Ashe, Jes Macallan, Olivia Swann, Amy Louise Pemberton, Nick Zano, Dominic Purcell, and Matt Ryan return as Sara Lance / White Canary, Zari Tarazi, Ava Sharpe, Astra Logue, Gideon, Nate Heywood / Steel, Mick Rory / Heat Wave, and John Constantine.

In September 2020, Lisseth Chavez joined the main cast as an original character named Esperanza "Spooner" Cruz.

[33] In December 2020, David Ramsey, who portrayed John Diggle in the Arrowverse, was revealed to be appearing in the season in an undisclosed role.