Henry meets an old Tool Box in the garage. Henry learns about all the different hand tools and what they do and what an invention is. Box is upset because he thinks he will never make any useful inventions because he's just surrounded junk and boxes of old broken knick-knacks. Henry becomes an inventor, is transported to a secret laboratory and turns the Junk into spectacular inventions! Toolbox gets a little disheartened that no-one would ever need inventions as useless as these! But Henry has a great idea, he uses the birthday candle blower to blow up a hot air balloon, the cheese and cracker to teach people how to karate chop and the banana dispenser to feed monkeys at the zoo! Turns out the inventions are useful after all! Hurrah!