Watch Supernatural season 11 episode 16 online: Sam and Dean investigate Bobby and Rufus's old case

Supernatural season 11 returns from a three-week hiatus on 23 March at 9pm EST on The CW. The show will resume from episode 16, which is titled Safe House. Fans will get Jim Beaver reprise the character of Bobby Singer, while Sam and Dean Winchester will work on a case, which Bobby and Rufus had previously worked on.

The official synopsis of the episode reads as follows:

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.

Click here to watch the episode online on the official CW website (only in the US).

Warning: Potential spoilers ahead

The upcoming episode will feature the return of Bobby, alongside Steven Williams who plays hunter Rufus (who was killed in season 6 episode 16). Speaking about the episode, executive producer Jeremy Carver told TVLine: "[Dean and Sam] are going to be investigating an old case that was once investigated by Bobby and Rufus [during season 5]."

Jim Beaver spoke about Bobby and Rufus's (Steven Williams) dynamics in an interview with Examiner. Speaking about his co-star Williams, Beaver said, "It was probably easier this time because I've kind of gotten used to Steven! He's a dynamic personality and he loves to improvise and ad lib (to the extent the director will let him!), while I'm kind of a stick-in-the-mud, stick-to-the-script kind of guy. It took me a while to get used to working with Steven, but I really like it now. It's always an adventure with him."

According to him, Bobby and Rufus are a great "odd" couple. The actor continued, "He always knows what I'm going to say, but I never know what he's going to say. It keeps our scenes energized. I don't remotely mean he's not professional — he's very, very professional. We're just different type humans. I'm a bit cautious. He doesn't have a fearful bone in his body, I don't think. "

"We have a lot of fun, too. Bobby and Rufus are a great odd couple. They could probably do that play together, except they'd both have to play the slob," he added.