[No.] 25 [Title] "The Scarifying Seaweed Secret" [Original airdate] 8 March 1980 [Synopsis] 
Ms. Snowden is supposed to be the heir to a fortune. But she must stay on the island, or her relatives will inherit the fortune. Captain Caveman and the Teen Angels are called in to investigate when the relatives start disappearing thanks to a mysterious sea creature. They soon find out it was a hoax by the relatives so that they would get the money.