The CW superhero family's "Elseworlds" crossover will take place in an even bigger universe than you thought. Per Comicbook.com, Arrow star Stephen Amell teased during a Facebook livestream that there will be a moment at some point in the crossover event that Smallville fans should brace themselves for.

Amell said that people from the young Superman show like Tom Welling or Michael Rosenbaum (and definitely not Allison Mack) won't be showing up, but it sounds like it'll be something like a recreation of an iconic moment from the series that ran from 2001 to 2011 on the WB and the CW.

"It is not a Smallville reunion, although I think it becomes pretty clear in the promos for the crossover that there are Smallville elements, at least, in terms of location." Amell said. "And if you're a fan of Smallville, and I have no idea if they're going to keep this in the final cut, but there's a treat in there, I swear. Full disclosure, I've never seen an episode of Smallville before, sorry! I wasn't that into comic book TV shows when I grew up. I've since seen a couple, for very obvious reasons. But as someone who wasn't a diehard fan of Smallville, this moment made me jump out of my seat. If you're a fan of Smallville, you may want to put down rubber sheets or something like that. Because, quite frankly, you might piss your pants."

What do you think it will be?

The "Elseworlds" crossover will begin on Sunday, December 9th with The Flash at 8/7c, followed by Arrow on December 10th at 8/7c, and Supergirl on December 11th at 8/7c.

(Full disclosure: TV Guide is owned by CBS, one of the CW's parent companies.)

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