When Scooby and the gang are taking a tour of London, they run afoul of horrible screaming skulls of English legend! They team up with an eccentric man who claims to be none other than Sherlock Holmes.
A Thunderian named Lion-S arrives on Third Earth. Lion-O becomes impressed with Lion-S's moves while she becomes impressed with Lion-O's new sword tricks. Lion-O thinks he has found a kindred spirit and a potential new ThunderCat.