It was a bittersweet holiday for many Doctor Who fans this year, as the series' buzzed-about Christmas special also marked the end of Peter Capaldi's run as the Twelfth Doctor. But for one heartbroken kiddo, the end of Twelve had a surprise silver lining: on Christmas Day, his gifts included a handwritten note from Capaldi himself.

The letter was shared on Twitter by the father of the young fan, who wrote, "#PeterCapaldi is my 9 year old son's fav #DoctorWho and he was dreading his regeneration. And then he got this letter with some words of comfort from the Doctor himself among his Santa presents. Such a kind man."

Capaldi's note described the Doctor Who regeneration process as sometimes icky ("like really bad flu"), but encouraged the boy to look on the bright side — and remember that no Doctor is ever truly lost.

"The new doctor always becomes your favorite 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," Capaldi wrote. "It's like the Doctor says, 'Everything ends and it's always sad. But everything begins again, and that's always happy. Be happy.' So, have a brilliant Xmas, a happy new year, and a wonderful life — I'm sure you will."

#PeterCapaldi is my 9 year old son's fav #DoctorWho and he was dreading his regeneration. And then he got this letter with some words of comfort from the Doctor himself among his Santa presents. Such a kind man. pic.twitter.com/Dki37Wt6Er

— Brian McGilloway (@BrianMcGilloway) December 27, 2017