Picking up from the end of last week's episode, we learn that Cole the kidnapper has a hard-on for Dean after the elder Winchester killed his daddy a decade ago. He has spent the subsequent years training himself - via Special Ops etc - for his ultimate confrontation with Dean.
However, Sam manages to give him the slip (or is he allowed to escape?), and heads off to track down Dean himself.
Meanwhile, the fall of Dean Winchester continues. He is becoming increasingly violent and uncontrollable under the influence of the First Blade and the Mark of Cain, so Crowley tries to channel that anger to his own ends by employing Dean as his 'hit-man' (to extract payment for the deals he has struck for peoples' souls).
Unfortunately, Dean does his own thing, which pisses off Crowley, leading to the King Of Hell disowning Dean and 'selling him out' to Sam.
Sam, though, has been trailed by Cole, who uses this opportunity to launch his attack on Dean.
The secondary plot of Reichenbach deals with Angel Hannah's increasing attraction to the wounded Cas and her attempts to strike a deal with the captive Metatron to reclaim Castiel's missing Grace.
Much like Black, Reichenbach is more about character development and movement than action (although, of course, the episode boasts its fair share of violence).
While we are only two episodes in to Season Ten, it is starting to look as though the main arc of the season is going to be Sam's efforts to bring Dean back to the light side.
Metatron's posturing from his prison cell sounds like he's building up for a rerun of Season Nine's dynamic, so if that's the route the show goes I hope they find an interesting new direction to take things.
I'd rather hoped that we'd seen the last of Metatron - at least for a while - at the end of last season, so I'm keeping my fingers crossed that this year doesn't devolve into a rehash of the angel/demon wars we've just witnessed.