Scooby-Doo and Guess Who?
Cher, Scooby and the Sargasso Sea!
S2 E19:
Scooby-Doo and the gang are hitching a ride with their friend Cher on her yacht coming back from the Azores to the Caribbean. They run aground in the strange Sargasso Sea full of thick sargassum seaweed and a graveyard of old ships.