The milestone installment, directed by series star Caity Lotz, will revisit past seasons of the CW’s time-travel series through the eyes of the Waverider’s A.I. Gideon (Amy Louise Pemberton), who will be a flesh-and-blood member of the Legends in season 7.
“The whole episode really is predicated on memory and Gideon’s memory,” executive producer Phil Klemmer revealed to TVLine. “It occurred to us, in being forced to do a retrospective of 100 episodes, that Gideon, really, is the only person who saw everything. Obviously, Sara Lance (Lotz) has been there from the very beginning, but she’s just a person. There were things that she missed. And so, we were really excited about going back through the seasons and sort of tracking the evolution of the show and doing that through Gideon’s eyes.”
Klemmer added that the 100th episode will see the newer members of the Waverider crew meeting the former Legends that came before them for the first time. “We also wanted to give a chance for the newest generation of Legends, the Astras and Spooners of the team, to meet up with some of the original gang,” said Klemmer, before sharing that there will be “some [other] special guest stars” in the milestone installment aside from Miller.
Miller made his debut appearance as Snart in season 1, episode 4 of The Flash in 2014. Two years later, the actor went on to join Legends of Tomorrow, appearing as a series regular until Snart’s heroic death at the end of the freshman run.
Despite Snart’s death in Legends of Tomorrow season 1 finale, Miller continued to recur in seasons 2 and 3 of the show as different incarnations of Snart, including the character’s Earth-X version, Citizen Cold, who briefly helped Earth-1 Legends deal with the death of Martin Stein (Victor Garber) following the Crisis on Earth-X crossover.
Legends of Tomorrow season 7 premieres on Wednesday, October 13th at 8 p.m. ET on The CW, while the show’s 100th episode is set to air on October 27th.