SPOILER WARNING: This article contains major spoilers for “Crisis on Earth-X, Part 4,” the fourth episode of this year’s Arrowverse crossover.
The Arrowverse just gained a new hero. In "Crisis on Earth-X," this year's Arrowverse crossover, Citizen Cold elected to remain on Earth-1 rather than return to his homeworld Earth-X.
"I think I'm going to stick around here for a little while," Citizen Cold said to The Ray as Cisco "Vibe" Ramon prepared to breach them both back. "I won't stay here forever. I will come home to you. Promise."
Ray offered him a sad smile and replied, "Okay." With an exchange of "I love you," they shared a kiss goodbye, and Ray stepped through Cisco's breach to return to Earth-X.
Unlike The Ray, who is originally from Earth-1, Citizen Cold is native to Earth-X. As shown over the crossover, this version of Leonard Snart is more of a hero than his thieving Earth-1 counterpart; Leo is much more sentimental and rule-abiding, a lover and a fighter.
This new development, of course, opens up Wentworth Miller's fan-favorite character to appear on the other Arrowverse series: Supergirl, The Flash, DC's Legends of Tomorrow and Arrow. Miller started out as Captain Cold on The Flash, before becoming a full-fledged member of the Legends in Season 1, where he heroically sacrificed his life to save his team.
Earlier this month, Miller announced he will make his final appearances during Season 4 of The Flash and Season 3 of Legends of Tomorrow before saying goodbye to his role for good. It is unclear where or when he will exit the Arrowverse.
This year’s four-part crossover “Crisis on Earth-X” will air across two nights, beginning Monday, Nov. 27 with Supergirl and Arrow (on a special night for one week only) and concluding Tuesday, Nov. 28 with The Flash and Legends of Tomorrow.