Well played, Karen Gillan! The 25-year-old Doctor Who actress surprised her fans at Comic-Con on Saturday, July 20, by wearing a red wig and revealing a newly shaved head.

PHOTOS: Stars going bald

Gillan, who is set to star in 2014's Guardians of the Galaxy, posed on the Marvel Studios Press Line in San Diego, Calif. sporting shoulder-length red hair and parted bangs. But the hairdo turned out to be fake.

During the film's panel, a fan pointed out that Gillan's character Nebula is supposed to be bald. "Yeah, she is -- and I might have done something a little bit crazy," she said, as she pulled off her wig and revealed her bald head underneath. 

PHOTOS: Stars without makeup

"It's liberating," Gillan told the crowd, reports Just Jared. "I think everyone here should shave their heads."

PHOTOS: Stars' summer hair makeovers

Tell Us: How do you think Gillan looks with a bald head?

This article originally appeared on Usmagazine.com: Karen Gillan Removes Wig, Reveals Bald Head at Comic-Con