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Ever since it was announced that Supergirl was moving from CBS to The CW, there’s been only one word on everyone’s mind: crossover. It was only days after the Supergirl announcement that CW president Mark Pedowitz confirmed that a Supergirl/Arrow/The Flash/Legends of Tomorrow crossover was in the works.

Invasion!

Flash-forward to today, and we’re only weeks away from seeing that crossover on our television screens. Titled Invasion!, the event is based on the 1988 DC Comics limited series of the same name. The story will see the alien Dominators coming to take over Earth, leading all the superheroes to team up, and for Barry Allen and Cisco Ramon to cross dimensions and bring Supergirl to help.

“It really does feel like, in the middle of the season, a three-hour movie.”

Yesterday was EW’s annual PopFest event, and they gathered the stars of all four shows onstage. Stephen Amell, Grant Gustin, Melissa Benoist, and Caity Lotz were joined by executive producer Greg Berlanti. Throughout the panel, ongoing storylines from all four shows were discussed, but the bulk of the conversation focused on the upcoming crossover.

“They’re all going to have their own continuing storylines,” said Berlanti. “It really does feel like, in the middle of the season, a three-hour movie.”

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Arrow‘s 100th Episode

Amell commented on the fact that Arrow‘s chapter in the Invasion! crossover also happens to be the show’s 100th episode. To Amell, the team-up between the shows was “emblematic” of what Arrow stands for. “To me, the 100th episode had to be a crossover,” he said. “It gives us a chance to do something for the fans that, in the normal course of our season, we would never get to do.”

“This one’s just bigger. Almost everyone interacts with every other character at a certain point.”

As the star of last season’s Supergirl/Flash episode, Gustin has taken part in more crossover events than anyone else. “This one’s just bigger,” he said. “Almost everyone interacts with every other character at a certain point.”

Dolph Lundgren and Olicity

Amell also talked about the upcoming Arrow episodes with action star Dolph Lundgren. “He brings a different energy to the show. The first time we meet him, it just feels different — even the way that it’s shot,” said Amell. As a fan who grew up on Lundgren’s 1980s action movies, Amell is thrilled to get to fight him on Arrow. “I mean, come on,” he said. “Come on.”

One major issue that hasn’t yet been broached this season on Arrow is the status of “Olicity,” the relationship between Oliver Queen and Felicity Smoak. “We haven’t really discussed our relationship yet this season,” Amell said, “but Oliver and Felicity discuss a little bit about the relationship, and where it is, in this week’s episode.” Berlanti elaborated, “Obviously, they work together every week. They’re very close. I can’t imagine anyone that would ever be in either of their lives that would replace the other person.”

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Flashpoint and Savitar

Meanwhile, on The Flash, we have the impending arrival of the evil speedster Savitar, who Gustin says is coming “very, very soon.” Berlanti added, “He’s the god of motion, so Flash is up against his biggest foe yet.”

Obviously, the big storyline on The Flash this reason is the timeline changes as a result of Flashpoint. Gustin elaborated on how Barry is dealing with the repercussions of his actions. “Barry’s got a lot of feelings. He’s a sensitive guy. He beats himself up, I think, quite a bit,” he said. “As soon as he starts to realize what the repercussions are, it weighs on him heavily.”

“He’s the god of motion, so Flash is up against his biggest foe yet.”

Berlanti says the changes are here to stay, though. “I’m not sure that we can [return to the original timeline], given what we’ve established,” he said. “If we’re not challenging ourselves and creating new territory and new obstacles for the characters, I think it’s less rewarding to watch and probably less rewarding to play. We like to grow ourselves and grow our characters.”

The Other Captain Lance

On Legends of Tomorrow, the team is still reeling from the loss of Rip Hunter, with Sara stepping up to take over. “I think she’s kind of naturally been backseat leader [already],” said Lotz. “But now that it’s actually her responsibility, I think it’s kind of stressful, because everything’s your fault. She’s kind of got to get her act together.”

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Superhero Fight Club

With all four stars together, the inevitable debate arose over which hero would win in a fight. Benoist was adamant that Supergirl would take them all down. “She’s got heat vision! She flies!” she said. Amell was certain the level-headed Green Arrow would be the winner. “I’ll let you destroy each other and then I’ll come in and mop up,” he said.

“You’ll see some of that in the crossover.”

More interestingly, Berlanti added, “You’ll see some of that in the crossover.”

Supergirl airs Mondays at 8/7c, The Flash airs Tuesdays at 8/7c, Arrow airs Wednesday at 8/7c, and DC’s Legends of Tomorrow airs on Thursdays at 8/7c, all on The CW.

The Invasion! crossover event is expected to air sometime toward the end of November. We’ll have the confirmed dates as soon as they’re announced.

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