The Scooby-Doo Detective Agency is hired by Herr Dreisbach of the Black Forest Toy Shop, to discover who is stealing his profits from his safe. Does it have anything to do with the toy store being built over the elf kingdom, and where is the treasure that Herr Dreisbach's great-grandfather found? / Dr. Carlin, director of research, at the Antarctic Scientific Research Camp, hires the detectives to find out who is sabotaging his research work on sea lions and penguins. All the researchers want to go home, but the Professor won't let them leave until the research information is found.