Upon hearing that a mysterious giant Spinosaurus fossil has arrived at the Cosmic Town Museum, Mick goes to visit. However, the museum director shocks him with the fact that "the fossil vanished at the excavation site." Who can you rely on in such a troubling time? The famous detective, "Butt Detective"! Mick immediately requests an investigation. Where did the fossil disappear to? Butt Detective will solve it in a cosmic flash!