Be Cool, Scooby-Doo! (2015)

S1E25 The Norse Case Scenario

Fred decides to sharpen the gang's detective abilities by organizing a camping trip in the great outdoors. Their chance to crack a mystery arises when they learn that viking ghosts have frightened away all the campers from the site. As they investigate, the gang must cleverly evade the park ranger to avoid being trapped in "Forest Jail" for eternity.