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Here's what we know about episode 16, the first one back from hiatus.

The official description

Safe House (9:00-10:00 p.m. ET)

JIM BEAVER RETURNS A dangerous creature is accidentally released into an old house, attacking a mother and her child, leaving them both in a coma. Sam (Jared Padalecki) and Dean (Jensen Ackles) learn that Bobby (guest star Jim Beaver) and Rufus (guest star Steven Williams) once tracked the same entity so the Winchesters look to the past to come up with a plan to catch the monster before any one dies. Stefan Pleszczynski directed the episode written by Robbie Thompson.  Original airdate 3/23/16.

The promo, which covers not only this episode, but upcoming episodes as well

The sneak peek

and the EW article that accompanies it.

Sneak peek #2

The promotional pictures

The return of Bobby and Rufus was covered by TVLine.

In an interview with TVLine, Jeremy Carver stated
“[Dean and Sam] are going to be investigating an old case that was once investigated by Bobby and Rufus,” in what would have been Season 5, executive producer Jeremy Carver tells TVLine. 

“There’s a lot of great throwbacks to things that happened” during that season, the EP continues, including “the wonderful relationship between Bobby and Rufus. That’s going to be a really neat episode.”
Other media outlets are releasing interviews on this episode.

From Zap2It Rufus and Bobby return to ‘Supernatural’ — Steven Williams warns, ‘Watch your back!, TvInsider Rufus and Bobby Are Back on Supernatural! Get Details of the Return, and from The Examiner 'Supernatural' actor Steven Williams chats the return of Rufus and Bobby and Catch up with 'Supernatural's Jim Beaver about the return of Rufus and Bobby.

So we get to see a case that Bobby and Rufus worked, even though they were on the outs. What kind of creature do you think this is? Why weren't Bobby and Rufus able to stop it? The description makes this sound like a stand alone episode. Do you want it to be? Or do you hope that it somehow ties into the mytharc? Are you glad to see Bobby and Rufus again? I am. I loved them working together. Share your thoughts in the comments or in the discussion thread for episode 16.