The Wolverine sees Hugh Jackman‘s titular character tangling with a whole new set of friends and foes, but it seems at least one of his old pals will be making a reappearance. One of Jackman’s former X-Men co-stars has been spotted making the trip to The Wolverine‘s Sydney set to shoot a cameo. Who is it? Find out after the jump. And yes, obviously, spoilers follow.

We Got This Covered (via AICN) reports that Famke Janssen, who played Jean Grey in X-Men, X2, and X-Men: The Last Stand, has flown to Australia to shoot a cameo. It’s unclear how exactly she’ll fit into the story. The Wolverine is assumed to be a prequel to 2000’s X-Men, and the characters’ encounter in that movie suggested they’d never met before. Maybe the Wolverine filmmakers will retcon an explanation, or maybe they’re just figuring that if X-Men never explicitly said the two had never met, they can just fudge it and say they met briefly, once, a long time ago. Or perhaps part of The Wolverine will take place closer to the present.

The news comes shortly after the actress made coy comments regarding her possible return to the X-Men universe. When MTV brought up the subject during an interview for Taken 2, Janssen responded, “One never knows. Jean Grey, the Phoenix. She finds a way to reincarnate herself constantly, so one never knows.” Janssen isn’t the only former X-Men star coming back to the franchise, either. A few weeks ago, Patrick Stewart announced that he’d be reprising his role as Professor X for X-Men: Days of Future Past, and suggested that some of his other co-stars (including Janssen) might do the same.

The time-traveling premise of Days of Future Past gives Fox plenty of opportunity to bring together the disparate arcs of the original X-Men trilogy, the First Class series, and the Wolverine prequels. And the fact that the studio is bringing back its old stars to pop up in the new movies suggests that they’re taking advantage of it. What remains to be seen is just how this universe will fit together, and where Fox will go from here. The Wolverine hits July 26.

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