Last night’s “special episode” of The Flash kicked off Elseworlds crossover event, which gave fans a glimpse of another CW show.

And no, it’s not DC’s Legends of Tomorrow. And not even Black Lightning. It’s Smallville!

When The Flash and Green Oliver travel to Earth-38 to see whether Supergirl would realise that the two have switched places, they find her visiting her cousin Clark Kent and Lois Lane. This happens to be a farm from Smallville, a location that’s easily recognisable to longtime viewers when actors shared some behind the scenes photos during the production.

If this wasn’t enough, the music that played when the viewers approached the Kent Farm was the theme from Smallville.

When Superman was slated to come to Supergirl, many fans wanted Smallville’s Tom Welling to reprise the role, but that didn’t work out. The series has, however, made a close reference to Chloe Sullivan, a supporting character created for the Smallville.

“When Greg Berlanti first talked to me about why he wanted to do crossovers, it was because it’s for the fans,” Arrow star Amell said during a Facebook live during the production of the crossover. “It’s so people can watch characters and scenarios that combine their favorite things on TV or introduce them to new things on TV. But you also get this license to do things that we could never do in the vacuum — especially on Arrow — that we can never do in the vacuum of just our show.”

“It’s awesome,” Hoechlin said of Lois being involved with the crossover earlier this year. “It’s really exciting to have a lot of these new characters popping into this one. The crossover has always been a huge event, but it seems like there’s a lot of new characters coming into it for the first time this time, so it should be a lot of fun.”

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