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 of all kinds.