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Arrow boss Marc Guggenheim teases 'most ambitious' crossover yet

When Arrow, The Flash, Supergirl, and the Legends of Tomorrow gather for the upcoming epic four-way crossover, they'll be faced with their toughest challenge yet: The Dominators.

In the comics, specifically in Invasion!, the Dominators are technologically advanced aliens who form a coalition with various other races to invade Earth and eliminate the threat posed by unpredictable metahumans.

"I will say that their goal is very closely related to what was established in the comics, and it does have to do with metahumans," Arrow and Legends executive producer Marc Guggenheim told EW on our SiriusXM radio show Superhero Insider. "It's very, very faithful to the comics."

The arrival of the Dominators will force the Arrowverse's superheroes to team up for what Guggenheim calls their "most ambitious" crossover yet. "I think it's massively different," he says of the four-way team-up. "The first crossover we did was two separate storylines that had a slight tangential connection to each other. Then last year, the crossover we did was a two-parter that told one complete story with a beginning, middle, and end across Flash and Arrow, but it also had the work of setting up Legends of Tomorrow."

"This year," Guggenheim continues, "we're doing by far the most ambitious crossover we've ever done. It's basically a huge three-part story that also brings in Supergirl, so it's crossing over all four shows. It's telling one big epic movie of a story. It's not setting up any other spin-offs, it's just big, bombastic, huge action. There's also some really poignant character moments. There's a lot of plot lines, particularly I would say in Flash and Legends, that come to fruition in the crossover. It's by far the most ambitious thing we've ever attempted. I want to say it's by far one of the most ambitious things anyone in network television has ever attempted. It's completely insane."

The Flash-Arrow-Supergirl-Legends of Tomorrow crossover is expected to kick off in November. Get more scoop here. Tune in to SiriusXM's Ch. 105 on Thursdays at 11 a.m. PT/2 p.m. ET for more on The CW's super series on Superhero Insider, hosted by Kyle Anderson and this reporter.