It's been 30 years since Stan had started working on that machine. But what is its purpose? One day Dipper and Mabel, after finding Grunkle Stan's behavior more weird than usual on a certain day, they resolve to find out what had happened and how they can help. But will it be too much for them to handle? Twin-theory themed story

Muppets Most Wanted centered universe. Investigations can be difficult and with two people as different as Sam the Eagle and Jean Pierre Napoleon, it can be a major pain.