Proving that, even 11 seasons in, the Supernatural crew are still innovating, Baby was an impressive "monster-of-the-week" tale told entirely from the point of view of the Winchesters' iconic car.
Except for the very last shot, all the action of the episode was filmed from within the car, capturing both the excitement of the brothers' life (namely fighting monsters, impersonating FBI agents etc) and the mundane minutiae of life on the road (classic rock, discussions of dreams and the future, reminiscing etc).
That said, the story wasn't entirely divorced from the season arc, as it was referenced quite forcefully in both the monster's motivation and a vision Sam has when he falls asleep.
Primarily a two-hander for Sam and Dean, Cas turns up as a disembodied voice via the speaker on Dean's phone, providing added humour to the episode as he battles to grasp Netflix and tries to solve the case from his "sick bed" back at the bunker.
If, after last season, you were starting to wonder if Supernatural was running out of steam or nearing the end of the road, the incredible start to this season must blow away those misconceptions.
On the back of three super-strong episodes, Baby proves that the show is still capable of coming up with something new, while simultaneously juggling an overarching plot with old school "monster-of-the-week" episodes.