"Episode 8 ends with a cliffhanger where Peggy (Hayley Atwell and Jarvis [James D'Arcy] get in big trouble and are knocked out," executive producer Michele Fazekas told EW. "Episode 9 begins with a dream sequence that starts in black and white — by the way, [Atwell] was made for black and white. She looks like Rita Hayworth. She looks spectacular."
The dream sequence will begin in black and white, and escalate into a full color Broadway number, featuring an original song from lyricist David Zippel and composer Christopher Lennertz, created while working with executive producers Tara Butters and Fazekas.
The sequence will be choreographed by Dancing with the Stars' Louis van Amstel, and features several of the show's professional dancers, including van Amstel, Dmitry Chaplin, Karina Smirnoff, Anna Trebunskaya, Sasha Farber and Damian Whitewood. They'll be joined by dancers Robert Roldan, Malene Ostergaard, Amanda Balen, Serge Onik, Jenya Shatilova, Lacey Escabar, Alla Kocherga and Paul Kirkland.
The crossover episode will also feature the return of Lyndsy Fonseca as Peggy's friend Angie Martinelli. Angie will be Peggy's "Jiminy Cricket," so to speak.
"She's your conscience and she's speaking the things that Peggy maybe can't say to herself," Fazekas says. "It ties things back together from the first season and it's connecting all of these things in a way that only a dream can do."
Agent Carter Season 2 premieres Jan. 19 on ABC.