Luna and Fizzle are best friends like any other except for one thing: Fizzle is an alien from the planet Popsy! Planet Popsy has three suns so it never ever goes dark. That means that Fizzle is learning about bedtime for the first time in his life! Thankfully Luna is there to help show him how to brush his teeth, take a bath and even put on his pyjamas! It's lucky she's such a great teacher.