Matt Smith wasn't the only one wearing a wig in the Doctor Who Christmas special, his former assistant Karen Gillan made a fleeting appearance in the hour-long special wearing a long, ginger wig.
The actress first appeared alongside Matt as his assistant in 2011 as his reincarnation of the Time Lord's first assistant, Amy Pond.
But the star was wearing a rather special wig for the celebratory Doctor Who Christmas special; the wig was made from Karen's own hair($46 22" ), shorn off earlier this year.
Wiggy times: Karen Gillan returned to Doctor Who wearing a wig made from her own hair
The star revealed a shaven head earlier this year to a stunned audience during the 2013 San Diego Comic-Con International as part of her preparation to play Nebula in her new movie Guardians of the Galaxy.
The Scottish actress made a brief appearance as Amy at the end of the Doctor Who Christmas special episode as viewers saw Time Lord Matt Smith bow out and hand over the controls of the Tardis to Peter Capaldi.
Smith had to wear a wig after having his head shaved for his role in Ryan Gosling's film How to Catch a Monster, while Gillan had her hair cut off for the Marvel sci-fi film Guardians of the Galaxy.
Now you see it... Karen shaved her hair earlier this year in preparation for a movie role
Former assistant: Karen Gillan was Matt Smith's first assistant back in 2011
Moffat said: 'They're very good wigs but they're both wigs. Though in Karen's case that's her own hair.
'That wig is made of her own hair, it's just detachable now.
'When they cut her hair they made her a wig of her own hair. Didn't she look lovely?'
The Time Lord: Matt also wore a wig during the episode as he had started filming How To Catch A Monster
He said he had no hesitation in bringing Gillan back for Smith's last episode, saying the pair were 'so iconic'.
He said: 'It was just nice to bring her back, also I just thought it would be good for Matt to have her on set.'
Moffat said Matt's 'heartfelt, brilliant and ancient' performance as an aging Doctor was perfect, adding: 'It's an end of an era, he should talk that way. You need a combination of huge sadness and lucky it doesn't end here.'
The New man: Peter Capaldi made his first appearance in the show on Wednesday evening