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A lot has changed in 4 years.

The stars of "24: Live Another Day" were seen filming their upcoming Fox miniseries in London on Wednesday -- where one of them looked like a totally different person.

Yep, that Lisbeth Salander-looking lady is none other than Mary Lynn Rajskub, better known as CTU analyst Chloe O'Brian.

With a dramatically different haircut, piercings, tattoos, intense makeup and a black leather outfit, Rajskub was seen avoiding an explosion with Kiefer Sutherland.

It's unclear whether her character is just in disguise or if this is indeed her new look, but Mary Lynn recently opened up about how Chloe has changed for the new episodes.

"When you find Chloe, she's just somewhere we've never seen her before. She's in a bad, bad spot," the actress tells E!. "I've gone anti-government and when Jack and I are finally reunited, we're not seeing eye-to-eye."

What do you think of the makeover? See how different she looked just days ago at the Fox TCAs in Los Angeles:

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See Chloe and Jack Bauer back in action when "24: Live Another Day" premieres Monday, May 4 on Fox -- and check out more explosive set pics in the gallery above!

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