In a recent interview with Rotten Tomatoes, Arrow and DC’s Legends of Tomorrow Executive Producer Marc Guggenheim revealed that an “established” DC character “who is not from the comics” would be joining the Legends of Tomorrow series in Season 3.
“We’re drawing on an established character who is not from the comics,” Guggenheim said. “Let me be very clear: not original to the show but not from the comics and not from any of the other DC Arrowverse shows.”
You’re probably wondering why we’re reporting on this at KryptonSite: It’s because this website, long before Supergirl, was considered the Web’s first source for Smallville news and information… and the Legends mystery character actually originated on Smallville.
Do you want to know what’s happening?
SPOILERS, obviously.

….and now she’s going to be a regular character in Legends of Tomorrow Season 3.
Chloe Sullivan has appeared in DC Comics continuity, at least prior to the “New 52” initiative; however, she did first appear in other media, having originated on Smallville.
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The Season 2 finale of DC’s Legends of Tomorrow airs this Tuesday, April 4 at 8PM on The CW.