Plot: Ruby and Marcus get entangled in a sibling battle for personal space during a class on undersea life. When Ruby stops to giggle over a fish which looks just like Earl, Earl gets so mad that he floods the school with giant hungry fish! A lonely only child, Earl also abhors siblings who can't get along, and enjoys plunging them into ""an ocean of space""! Drawing on a home economics lesson about cooking, the kids plunge underwater in a pressure cooker to unclog the drain (and drain out the school)