Warning: Spoilers ahead for Doctor Who season 15, episode 3, "The Well."Ncuti Gatwa's Fifteenth Doctor admits to something in Doctor Who season 15, episode 3, "The Well," that confirms a theory I've had about the Time Lord since a 2008 episode with David Tennant's Tenth Doctor. As it turns out, "The Well" is a surprise sequel to "Midnight," which is one of my favorite episodes of the show ever. "Midnight" shows a side of the Doctor I'd never seen before, or at least never quite to such a degree.