During a swimming test in the middle of winter in the dreaded Strange Hill swimming pool, the kids discover a mysterious paradise island in the middle of the pool. They also soon discover the isle's longtime sole inhabitant, a mysteriously huge exchange student named Ken Kong. When Ken returns to the school with our kids, it throws Abercrombie into a panic. Will Ken destroy the school? Will Templeton's woodwork project save the day? Will Becky guilt Mitchell into fixing the problem? Probably!