Jack Rowand/The CW
March 18, 2017 at 06:57 PM EDT

It’s the moment that fans of the Arrowverse have been waiting for all season: The Legion of Doom will assemble in the winter finale of DC’s Legends of Tomorrow.

Throughout the first half of the season, Eobard Thawne, a.k.a. Reverse-Flash, has been hunting down various artifacts with the help of Damien Darhk (Neal McDonough). But the duo will soon grow into a foursome, as Legends has been teasing since San Diego Comic-Con.

During Thursday’s episode, a send-up to the 1987 gangster drama The Untouchables, the Legends uncover a time aberration in 1927 Chicago. In reality, Eobard has lured them to this era, and The Flash villain debuts his new teammates — though one isn’t someone viewers will be expecting.

“We introduce Malcolm Merlyn [John Barrowman] to the Legion of Doom as well as discover what the Legion’s agenda for the season is,” executive producer Marc Guggenheim tells EW. “The Legion of Doom not only brings Malcolm Merlyn into their ranks, but they partner up with Al Capone.”

Fear not: The expected addition of Captain Cold (Wentworth Miller) to the Legion is nigh, but this may not be the Leonard Snart that the Legends remember. “It’s an incredibly fun episode,” says Guggenheim, who remains coy about the arrival of Snart — except to say we’ll see him before the end of the hour. “Quite a few boxes get checked off,” Guggenheim says. That includes Stein’s (Victor Garber) recent discovery that he’s kept secret from the rest of the team.

The end of the hour will offer its own cliffhanger. “I would definitely watch until the final moment,” Guggenheim says. “There’s a surprise at the end that even if people are expecting it, they’re not expecting the way we’re doing it.”

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DC’s Legends of Tomorrow‘s winter finale airs Thursday at 8 p.m. ET on The CW. A portion of this interview aired on Superhero Insider, EW’s SiriusXM weekly radio show (Thursdays at 11 a.m. PT/2 p.m. ET on Ch. 105), hosted by Kyle Anderson and this reporter.

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