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The Supernatural/Scooby-Doo crossover starts exactly how you’d expect: Dean wrestling a stuffed dinosaur that’s come to life. What? Didn’t see that one coming?

After a case-of-the-week puts Dean in a wrestling match with the live plushy — not the show’s first — a grateful pawnshop owner offers the guys a free TV to say thanks. Sam’s not too keen on the idea, but Dean’s never one to turn down a gift. So, he takes the TV back to the bunker to create his “Dean Cave.” Only, everything’s not as it seems with the present. Spoiler: The boys are sucked into a Scooby-Doo cartoon. “Once they get over their amazement at being in the cartoon, two things happen,” co-showrunner Robert Singer tells EW. “They say, ’We’ve been in a situation like this before with the Trickster and I think we’re supposed to play this out.’ And then they realize they’re in a Scooby-Doo cartoon, which makes Dean incredibly excited because Scooby-Doo was his favorite cartoon growing up.”

In fact, Dean’s extensive Scooby knowledge will come in handy rather quickly when he recognizes the episode they’re in (which is based on the 1970 Scooby-Doo, Where Are You! episode “A Night of Fright Is No Delight”). But this episode isn’t exactly a repeat. This time, there’s a Supernatural-level monster at work, and, as co-showrunner Andrew Dabb puts it, “It gets pretty dark.” Singer adds, “There are things you wouldn’t see in a regular Scooby-Doo cartoon.” In other words, the monster won’t be a man in a mask. “They walk into an old episode of Scooby-Doo,” explains Dabb. “But it may end up being a new episode of Supernatural.”

EW has an exclusive first look at the hour, including a shot of Dean holding hands with Daphne, which is no accident. “Dean came of age in a time before the internet when Daphne wasn’t so bad,” Dabb says. “Dean has very strong opinions on all the Scooby characters, but especially Daphne and Fred.” And he’ll get to share them all when “Scoobynatural” airs on Thursday, March 29, at 8 p.m. ET on the CW.

Image zoom The CW

Image zoom The CW