Looks like Supernatural might be back on track with the second quality episode in a row.
Although ostensibly a "monster-of-the-week" episode, About A Boy managed to tie itself to the Rowena sub-plot without actually necessitating (thankfully) an appearance from Crowley's mother.
Fearing the draw of the Mark of Cain, Dean has shut himself away in The Bunker for a week, before Sam can lure him out with a possible case involving a person disappearing from behind a bar in a flash of bright light, leaving behind only their clothes.
At the bar, Dean gets chatting with Tina (Kehli O'Byrne) and they bond over their 'rotten childhoods', but when she goes to leave, Dean spots a strange man following her and investigates.
The next thing Dean knows, both he and Tina are waking up in a "serial killer basement"... in their teenage bodies.
The kidnapper, who turns out to be Hansel (Mark Acheson), from a version of the fairy story that didn't have a happy ending, has a witch's hex bag that regresses adults into their teenage bodies, while still retaining their grown-up mental faculties.
Teen Dean (Dylan Everett, last seen in Season Nine's Bad Boys) escapes and goes to fetch Sam, pointing out that while he is now going through puberty again and has a strange appreciation of the music of Taylor Swift, his teenage body is also bereft of the Mark of Cain.
Intent on rescuing young Tina (Madeleine Arthur), Dean and Sam return to Hansel's house to discover that he isn't working alone.
Penned by Adam Glass, who also wrote the Bad Boys episode and clearly 'gets' young Dean Winchester, About A Boy takes a potentially cheesy plot development (one of the leads is transformed into a teenager) and gives it a great Supernatural spin, complete with some unexpected twists along the way, and a wonderfully horrific climax.
The explanation of Hansel's "ability", his motivation, and how it all connected with Rowena fitted perfectly with the show's mythology. It's just a shame that it continues to look as though Rowena the pantomime villain is being set up as the season's Big Bad.