Scooby's Laff-A Lympics (1977)

S1E3 The Curse of the Viking Lake

Title: The Viking Lake Enchantment Plot: A museum curator joins forces with two geology students to masquerade as Viking spirits in a bid to deter visitors from a lake. Their true intention is to harness the region's geothermal energy for their own gain. As the trio navigates their ghostly deception, they encounter unexpected challenges that test their resolve and ethics, leading to a thrilling adventure filled with twists and surprises.