By KIMBERLEY DADDS and DAILY MAIL REPORTER
She appeared the previous day at Comic-Con sporting a luxurious head of shiny red hair.
But it turns out Karen Gillan had us all fooled.
The 25-year-old showed off a bald head a little later at the Marvel press line, revealing her previous hairdo was in fact a wig.
Karen took off her wig to reveal her hair during the press conference
The Doctor Who star shaved her head for her role in the 2014 Marvel flick Guardians Of The Galaxy.
Karen plays Nebula, a villainous pirate who spends much of her time trying to wipe out entire civilisations.
The actress wore a wig on Friday for a panel for season three of television show NTSF:SD:SUV, before unveiling her bald head for the Marvel panel the following day.
Karen showed off her slender figure in tiny shorts paired with black boots and a crop top
Karen has a busy year ahead as she launches her movie career.
She is currently hoping to make waves as she waves goodbye to her breakout role on Doctor Who.
Along with Guardians Of The Galaxy, she will star in the upcoming supernatural thriller Oculus.
She also has British romantic comedy Not Another Happy Ending under her belt.
Karen posed with her Guardians Of The Galaxy costar Lee Pace
Not Another Happy Ending premiered in June at the 67th Edinburgh Film Festival.
In the film she plays a writer called Jane Lockhart who is blocked on her second novel, after achieving huge success with her first.
Shot in Glasgow late last year, the film also stars Stanley Weber (Thérèse Desqueyroux, Borgia), BAFTA-nominee Iain De Caestecker (Agents of S.H.I.E.L.D, Filth, Young James Herriot), Kate Dickie (Prometheus, Games of Thrones) and Freya Mavor (Skins).