Space - S3.E18

While Jodie is setting up her display on space and the sky, Muffy is on the roof star-gazing when all of the sudden, a spaceship land there with an alien who is a mouse like Muffy. His name is XL7Z Fred from Squeakonia who is looking for cheddar cheese. But when Sam, Jeff and Muffy meet him, they think it's Muffy playing a trick on them. Fred wants to take Muffy back to Squeakonia with her but she couldn't leave her friends. Later, when Jeff, Sam and Muffy discover that there really is a Fred, they think that Muffy is leaving them.