mark gatiss peter capaldi

As Whovians everywhere said their last goodbye to Peter Capaldi’s Twelfth Doctor on ‘Doctor Who’ this week, writer Mark Gatiss shared a nice behind-the-scenes moment with the outgoing Doctor.

Gatiss, who also starred in the Christmas special ‘Twice Upon a Time,’ and has written numerous episodes. He snapped a picture of Capaldi on his last day wearing a piece of ‘Doctor Who’ history. His picture featured Capaldi in a special iconic purple jacket, and read:

“Thanks for all your kind words about ‘Twice Upon a Time.’ Here’s Peter on his last day, wearing Jon Pertwee’s jacket from ‘Planet of the Daleks!”

Pertwee played the Third Doctor between 1970 and 1974, and sported one of his most iconic looks in the 1973 serial ‘Planet of the Daleks.’

Capaldi has been giving out some rather emotional advice in the wake of his exit, most notably to one young fan who expressed concern over his regeneration. In his handwritten letter to the nine-year-old boy, he said:

“Even though [regeneration] can be a little icky (like a really bad flu), it has always, always turned out good for ‘Doctor Who.’ The New Doctor always becomes your favourite and the one that goes… Well, he never really goes. He is always there, somewhere in time and space, and if you think about him hard enough, you’ll see him and he’ll see you. It’s like The Doctor says, ‘Everything ends and it’s always sad. But everything begins again and that’s always happy.’ Be happy.”

As Twelve left the universe, fans got the chance to have a first look at the iconic Thirteenth Doctor, played by Jodie Whittaker. ‘Doctor Who’ will continue with its 11th series in 2018 on BBC One in the UK and BBC America in the US.