"The Gratitude of Trolls " is the Nineteenth episode of Season Four, and the 97th episode overall of School for Vampires. The episode aired in 2010 in Europe,
KiKA summary: Gothetta does the troll Cartilage a favor when she helps him with his romantic life. The strict code of honor of the troll species requires that Cartilage, who is now in debt to Gothetta, must do a good thing for her. However, all of his well-intentioned attempts are not particularly helpful to her. It gets even worse when Stoker tries to help him.