斯卡格拉克海峽位於丹麥、挪威和瑞典之間。該處波濤洶湧,令人聞之喪膽,不過水流也帶來養份,為魚類提供食物。這裡有勤勞的蟹、步行的魚和極具創意的甲殼類動物。其中一條河更是三文魚洄游地點。。Tom is grounded for lying to his mom about dragons. While stuck at home, the Riders need help in the Hidden World. Tom must figure out a way to help his friends without getting into any more trouble.。