'Supernatural' Boys and the 'Scooby-Doo' Gang Discover a Dead Body in Animated Crossover -- Watch! (Exclusive)

There's a new murder for Sam and Dean to solve, this time with the help of Scooby, Shaggy, Fred, Daphne and Velma!

The Winchester boys of Supernatural and the Scooby-Doo gang are teaming up to solve a new mystery ... in animated form!

On Thursday's special episode of Supernatural, appropriately titled "Scoobynatural," Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles) are zapped into the Scooby world when Dean brokers a deal for a possessed flat-screen TV after the brothers successfully defeat a human-sized "Barney." (Seriously!) After driving their Impala to the Malt Shop, the boys discover they're not in just any cartoon, they're in Scooby-Doo.

In ET's exclusive sneak peek, the brothers settle in for an evening at the Mystery Mansion with Scooby, Shaggy, Fred, Daphne and Velma, but their plans for a quiet night are derailed when they hear a scream from down the hallway. Sam and Dean, the latter forced to ditch his midnight sandwich, join the Scooby gang as they race to see what's causing all the commotion. 

When the group arrives in one of the bedrooms, they discover the bleak reality that there's been an actual murder. Suspect: unknown. Eek.

"Wait, wait, wait, no. The dummy bodies don't show up until later," Dean says, slightly confused by the twist.

"Dean, this isn't a dummy. This is blood," Sam says, blood seeping onto his hands as he takes hold of the blankets covering the dead body, revealing a bloodied knife to the back. "He's dead, like really actually dead!" 

"Son of a b***h!" Dean exclaims. 

Last October, Padalecki and executive producer Brad Buckner teased the anticipated (and super ambitious) hour-long animated crossover event.

"Never in my wildest dreams [did I imagine we'd do this]," Padalecki said at the time. "I grew up watching it, so to hear that animated you is going to be on the same screen with the Mystery Machine [is] super cool." 

"It is a charming and very funny episode," Buckner said. "It's like the better meta episodes, where you have fun with what the show is and now you get two shows to tweak. There's a certain amount of expertise on a certain brother about what Scooby world is, and we have fun with that."

Supernatural airs Thursdays at 8 p.m. ET/PT on The CW.

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