Young inventor Elliot, frustrated by bedtime always stopping his fun, asks the school librarian how day turns to night, then invents a way to stop Earth from spinning.
When the Mahoney family hires Henry the Critter Sitter to watch their dog, cat, bird, fish, frog, and snake, he thinks he is up for the challenge since creature control is his game, but the pets have a different idea.
Jerry's imaginative dad likes to build things, but when the jungle gym that started out fun grows out of control, Jerry's fear of heights--and the zoo animals and mobs of people the gym attracts--give Jerry the jitters.