I'll be honest, I've been hard-pressed to care much about the long-running Doctor Who TV show ever since the Steven Moffat/Matt Smith era, when the latter brought his impish charm and vigor to a character that's been a staple of British popular culture for decades.
No disrespect to Smith's successors who played future iterations of The Doctor, like Peter Capaldi and Jodie Whitaker, but Smith's Doctor (Eleven, in the parlance of the show) will always be my favorite. And Moffat, of course, was the perfect writer for him.