Given Supernatural's usual comic book, revolving door policy on the death of its leads, the resolution of the last episode was a genuine surprise and while the loss of Bobby's strong character will be noticed the impact on Sam and Dean is already fuelling some powerful dramatic content.
The brothers have spent weeks after Bobby's death trying to crack the numbers he gave them and they've teamed up with paranoid whackjob Frank Devereaux (Kevin R. McNally) - who helped get them "off the grid" in Slash Fiction.
While this is going on, a call comes in on Bobby's phone from 14-year-old Krissy Chambers (Madison McLaughlin) whose father, Lee (Ian Tracey) has disappeared. Sam goes off to help her while Dean checks on Frank, who they haven't heard from in a while.
Lee is an old hunter friend of Bobby's who was tracking down a murderous vetala preying on men at a truck stop diner. Sam follows up his leads and then Dean gets a call from Krissy to say that Sam has disappeared as well!
Adventures In Babysitting continues the themes that have been developing throughout this season of reflecting back on old adventures (Dean tracked vetala while Sam was in college) and the pessimistic outlook for those whose lives revolve around hunting monsters.
This was a solid episode, from scriptwriter Adam Glass, that presented the relationship of Krissy and her dad as an obvious reflection of Sam and Dean's relationship with both their own dad and, of course, Bobby. It gave Dean the chance to do some good above and beyond his usual "monster-killing" exploits by possibly saving Krissy from life as a hunter.
It would have been nice to have had some more time to learn a bit more about the vetala as, for all intents and purposes they might as well have been vampires for all the difference it made to the story, but there was a lot going on here with the main story and the sub-plot of Frank discovering what Bobby's numbers meant.