Join Dr. H and BB as they explore the planets in our Milky Way. Starting from Mercury, the planet closest to the sun, they land on each one to experience firsthand how different they are from their home planet, Earth! Along the way, they land in some sticky situations as they learn exciting facts about the planets and the rest of the universe in this wacky adventure series. A terrible storm brews outside Dr. H's home, so she decides to visit Earth's moon with BB. The explorers fly out there as BB learns facts about the moon. They explore the barren surface as BB finds his own fun with the landscape.