The Black Elf has stolen Roxor the elf's glove which allows him to control lightning. Lina asks Nils to help her recover the precious object. However, when they arrive at the Black Elf's lair, the villain has accidentally directed the lightning at himself and has now split into two distinct persons. With one Black Elf the balance of nature was already threatened but our heroes hardly dare think what will happen with two of them. They must quickly find a solution to merge the two Black Elves back into one person again.