Terry is a student at Camp Magic Pants and is the self-proclaimed "Chosen One". When Yin first meets him, she ends up being love-struck. That night, the head councilor divides everyone in into cabins. While Yin and Terry are placed in Cabin "Twinkle Trousers", the rest of the students, including Yang, are placed in Cabin "Evil Slacks".
Terry explains to Yin of a great beast that only the chosen one would awaken. Terry, along with Yin, participates in a competition where the winner will touch the golden statue of the Magic Pants. During the competition, Yin slowly begins to become corrupted by the pranks being pulled. Betraying Terry, she races to the end and places her hand upon the pants, whereupon the dark magic transfers to the statue and brings it to life.
It then turns out that the councilor was possessed by Yuck, and that Terry had been working for him all along. Terry bows down to Yuck as a humble servant, only to be squashed by the pants.
- Terry Otter's name and appearance are a play on the titular character of the Harry Potter series.