Sam, Dean and Castiel are transported into the animated world of Scooby Doo where they join forces with the Scooby gang to solve a ghostly mystery.

Dean goes off on his own to take on a case. Meanwhile, Castiel has an idea of how he can help Sam track down God.

Sam and Dean discover a wood nymph living in the bunker who is determined to protect her family, at any cost.

With the plan in full motion, Sam, Dean, Castiel and Jack fight for the good of the common goal.