It's the International Show-and-Tell Competition and Arnold and D. A. are representing Ms. Frizzle's class. Arnold brings in a webbed hoop, left behind by his great-aunt, a famous archaeologist, but he has no idea what it is! Can the kids find out what it is before Arnold and D. A. take the stage? With Alex Trebek as the "Sportscaster."—Samantha Pirrello