Legends of Tomorrow Season 5 premieres during the Arrowverse crossover event "Crisis on Infinite Earths," and one member of the time-traveling team plays an especially pivotal role: Sara Lance.
While the entire Legends ensemble is slated to appear in the crossover, showrunner and executive producer Marc Guggenheim confirmed Sara will be the primary focus due to her relationship with Oliver Queen.
"The crossover focuses primarily on Sara, Caity Lotz’s character, for a variety of different reasons -- certainly related to what happens with Oliver in the crossover," Guggenheim said in an interview with EW. "You’ll also see that the events of the crossover sort of kick off Sara’s emotional journey for Season 5 of Legends. We really come out of the crossover with Sara having a different perspective on things.”
Sara had been in a secret romantic relationship with Oliver prior to the start of Arrow and was present on the same boat that sank and left him stranded on the remote island of Lian Yu. As Oliver trained over five years to become a superhero, so did Sara, albeit separately, taking on the persona of Black Canary. Upon their reunion in Starling City during Arrow Season 2, they briefly rekindled their relationship before Sara was killed and resurrected to join the Legends of Tomorrow as White Canary in defending the space-time continuum.
With Oliver expected to meet his foretold end during the Crisis, the two partners may have one last moment together before the Green Arrow fulfills his heroic destiny.
"Crisis on Infinite Earths" begins Sunday, Dec. 8 at 8 p.m. ET/PT on Supergirl, then continues in Batwoman on Monday, Dec. 9 at 8 p.m. ET/PT and in The Flash on Tuesday, Dec. 10 at 8 p.m. ET/PT. After the winter hiatus, the crossover will conclude on Tuesday, Jan. 14 in Arrow at 8 p.m. ET/PT and in DC's Legends of Tomorrow at 9 p.m. ET/PT.