Georgina Sparks is making her way back to the Upper East Side for the very last episode of season 3, and the actress who plays her, Mercy cutie Michelle Trachtenberg, has some predictions about (pardon the pun) what sparks will fly upon her Gossip Girl return. “I’m sure there’ll be a big scandal,” Michelle tells E! Online. “She’s back for vengeance.”

Trachtenberg will share the screen twice this spring with one of her Gossip Girl buddies: Connor Paolo (Eric van der Woodsen) will guest on her hospital drama Mercy on March 3.

According to E! Online, on Mercy Paolo will play “a kid who sets off a pipe bomb on a commuter bus. He’s brought in as a patient, and the father of another boy on the bus goes after him with a gun.” As far as Gossip Girl, Trachtenberg foresees a showdown between her character and Blair Waldorf, played by her real-life buddy Leighton Meester.

“I’m sure Georgina will be seeking vengeance They haven’t written it yet, but she was tricked and sent away, after all. And that li’l lady certainly doesn’t like to be tricked.” And remember who tricked Georgina into flying abroad with a so-called “prince” (played by doorman Vanya)? Yes, it was Blair, with the help of Dorota, of course!

“It’s so funny because Leighton [Meester] and I are so close,” said Trachtenberg last month. “And we always have to say, ‘I hate you!’ but it’s like, ‘I don’t really hate you, I love you!’ At her performances, [Leighton] has me at the front row and, like, we sing to each other while she’s singing up there. So, we’re the cheeseball friends.”