This week we dive straight into the sewer-soaked weirdness that is “The Mystery Menace” — an Orange Islands episode that asks one very important question: what if your big city monster problem was actually just one very large, very abandoned Bulbasaur with a bell on its collar and a personal grudge? On their way through Trovitopolis, Ash and the gang finally reach the biggest city on Mandarin Island South… and almost immediately get dropped into its sewer system thanks to Team Rocket blowing themselves up with their own trap. From there, the episode pivots into full urban legend mode as a vine-whipping creature lurking in the water snatches Bulbasaur, drags Misty and Togepi under, and turns a simple travel stop into a gross, surprisingly elaborate rescue mission.

From creepy bell sounds echoing through the tunnels to Officer Jenny tossing children in jail for sewer-related misunderstandings, the episode leans hard into its monster mystery premise before revealing that the “terror” beneath the city is much sadder and much dumber than anyone expected. The mayor, more worried about reelection than basic morality, decides the correct response to a rumored sewer creature is to send an armed squad underground and cover the whole thing up before the public finds out. Meanwhile, Ash’s one and only concern is getting Bulbasaur back, which leads to more sewer diving, Muk getting a rare moment to shine, and Team Rocket somehow having an even worse time than usual as they flee both the mystery creature and the city’s trigger-happy response. When the truth finally comes out, the episode lands on the reveal that the monster is actually the mayor’s own Bulbasaur, abandoned years ago for the crime of not evolving.

We break down the episode’s mix of city panic, abandoned Pokémon heartbreak, and absolute anime nonsense, from the logistics of a sewer system with hundreds of miles of tunnels to the fact that this giant Bulbasaur’s entire menace factor mostly comes from sneaking up on people instead of introducing itself normally. It’s filler with a strong hook, a bizarre amount of municipal drama, and a payoff that somehow manages to be both ridiculous and kind of effective. If you’ve ever wanted a Pokémon episode where the real villain is cowardly local government and the monster is just an oversized starter with unresolved emotional baggage, this one absolutely has you covered.