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Melissa Benoist is pictured above. She stars in the Elseworlds Crossover event. Benoist told TV Guide about the crossover: "This [crossover] was so fun in particular because it really was the triad, so to speak, the three of us. And Kara plays a really fun role in this dilemma that Barry and Oliver find themselves in. She's the only one that really recognizes them for who they are in this Freaky Friday situation, and it's really comedic. The whole thing. I think people will really get a kick out of it."
We will also finally meet Elizabeth Tulloch, who is playing the role of Lois Lane. Her previous credits include Grimm (Juliette Silverton/Eve in 119 episodes), Dead Draw, Concussion, Portlandia, Chronic, Parkland, Tyranny (Alexandra, four episodes), Quarterlife (Dylan, six episodes), Moonlight, Lonelygirl15 (Alex, 15 episodes), The West Wing (intern), and more. It's safe to say that she's best known for her role as Juliette on Supernatural. According to her IMDB profile, Tulloch was born in San Diego but grew up in Spain, Uruguay, and Argentina. She's married to David Giuntoli.
According to IMDB, the following cast is expected to appear in Episode 3, which is the Supergirl episode of the crossover: Melissa Benoist as Kara, Mehcad Brooks as James Olsen, Chyler Leigh as Alex Danvers, Katie McGrath as Lena Luthor, and David Harewood as J'onn J'onzz. Also listed are Cassandra Jean Arnell as Nora Fries, Stephen Arnell as Oliver, Jeremy Davies as Dr. John Deegan, LaMonica Garrett as The Monitor, Grant Gustin as Barry Allen, Tyler Hoechlin as Clark Kent, Sasha Piltsin as Kasnian Soldier, Ruby Rose as Kate Kane/Batwoman, and Elizabeth Tulloch as Lois Lane.
About Elseworlds: The crossover event beings with The Flash airing tonight instead of Supergirl on The CW (Sunday, December 9) at 8 p.m. Eastern/7 p.m. Central. The next episode in the crossover will be Arrow, which will air on Monday night, December 10, at 8 p.m. Eastern/7 p.m. Central. A new episode of Legends of Tomorrow will then air at 9 p.m. Eastern, but it won’t be connected to the crossover event.
The final Elseworlds episode will then air with Supergirl on Tuesday, December 11 at 8 p.m. Eastern/7 p.m. Central. A midseason finale of Black Lightning will air after that, also not connected to the crossover event.
Each episode of Elseworlds will have a different tone that matches the show "sponsoring" the episode. In these episodes, Oliver Queen/Green Arrow will switch identities with Barry Allen/The Flash, as a result of Dr. John Deegan (played by Jeremy Davies) manipulating reality. While they’re playing each other’s roles, they’ll also cross paths with Supergirl, Batwoman (being introduced in the Arrowverse for the first time), Superman, and The Monitor, whom we saw in the teaser, Comicbook.com reported.
The basic plot of the crossover event, according to Syfy, is that a godlike character called Monitor gives Dr. John Deegan the ability to reshape reality. Barry and Oliver, as a result, swap identities. They must recruit Supergirl to help them get things back in order before irreversible damage is done. Oliver and Barry are aware they're in the wrong bodies, so it makes everything that much more fun to watch. Click through the gallery to see more photos, news about the cast, and spoilers.