Franklin is excited because his friend Rabbit is coming over to spend the night with him in his backyard. Franklin's dad has set up an amazing rocket ship tent, and Franklin can't wait to play space travel with Rabbit and use all the cool equipment he and his dad have prepared, including fins for steering, a satellite dish, a laser and "zero-gravity grabbers." There's just one problem. Franklin's sister, Harriet, keeps interrupting them to ask Rabbit...