Neil Patrick Harris has already been Dr. Horrible, and now he's going to be horrible to the Doctor.
NPH has plenty of experience playing bad, notably doing so on "A Series of Unfortunate Events" television series, with a similarly dour expression though the nose is noticeably more normal.
Returning showrunner Davies confirmed the casting by commenting directly on Harris' post, writing, "We are honoured! So much fun!
The showrunner also released a statement with the official share of the image, but kept things typically pretty vague.
Davies was only slightly more forthcoming on his own Instagram, where he captioned the same image by telling fans NPH is "playing the greatest enemy the Doctor has ever faced.
His most famous and dastardly foe has always been The Master, a fellow Time Lord.
Gatwa will play the first Black Doctor, after Whittaker's first female Doctor, to lead the series.
Thank you for inviting me into your Whoniverse, [Russell T. Davies]. I'll try my hardest to do my worst," he wrote.