"Elseworlds," this year's three-show Arrowverse crossover, is making a major callback to Smallville. When Barry Allen and Oliver Queen go to visit Kara Zor-El on her Earth, they'll find her at the Kent Farm, as it appeared on the 2001 series. During a set visit, Supergirl star Melissa Benoist discussed the experience and teased some "really lovely" scenes on the set.

"We shot on the Smallville farm. That was really, really exciting. All of us were beside ourselves. To pay tribute to that show felt good. When you're there, even though it's in Canada, it feels like pure Americana," she said with a laugh. "It's kind of weird. There are some really, really lovely, heartwarming scenes on the Kent farm."

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As to the debut of Lois Lane, Benoist said, "She's known her for a while in our story, in our universe. But playing scenes with her for the first time, the way they've written her is perfect. I think people and fans especially of that mythology will really love it. And Bitsie Tulloch just nailed it."

During "Elseworlds," Oliver Queen and Barry Allen will swap lives. Thanks to Arkham Asylum doctor John Deegan, who was granted the power to rewrite reality by crossover villain The Monitor, Oliver is the Flash and Barry is the Green Arrow, and their respective teams are completely unaware of the switch. As such, they'll journey to Supergirl's Earth for help, where they'll meet not only her but also Lois Lane and the Man of Steel himself.

This year's Arrowverse crossover event will involve the casts of Supergirl, Arrow and The Flash. The event will unfold over three nights, starting with a special episode of The Flash on Sunday December 9 at 8 pm ET/PT. Then, it continues Monday, December 10, with Arrow, and concludes on Tuesday, December 11, with Supergirl.