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EP101 : Get Along, Little Pokémon
Original series
EP103 : Misty Meets Her Match
The Mystery Menace
Monster in the Sewers!?
First broadcast
Japan June 24, 1999
United States May 6, 2000
English themes
Opening Pokémon World
Japanese themes
Opening ライバル!
Ending タイプ・ワイルド
Animation Team Ota
Screenplay 武上純希 Junki Takegami
Storyboard 鈴木敏明 Toshiaki Suzuki
Assistant director 鈴木敏明 Toshiaki Suzuki
Animation director 志村泉 Izumi Shimura
Additional credits

The Mystery Menace (Japanese: ちかどうのかいぶつ!? Monster in the Sewers!?) is the 102nd episode of the Pokémon anime. It was first broadcast in Japan on June 24, 1999 and in the United States on May 6, 2000.

201 Spoiler warning: this article may contain major plot or ending details. 201


Ash, Misty, and Tracey walking in a mountainous/desert region that looks like Monument Valley. Ash is tired and hungry. He offers to eat if his companions are tired and hungry too. Tracey then calls to Ash and Misty to see what he is seeing. They run up to Tracey, and they discover that they have come upon the awesome metropolis that is the city of Trovitopolis, the largest city on Mandarin Island South.

Jessie, James, and Meowth spy on Ash and his Friends as this time. They have cooked up what they think is the perfect plan, in which they are acutally standing a large trap, as they have put dynamite under the ground and once detonated, they will have trapped Pikachu. Meowth prepare to activate a trap button. But dosen't work. Meowth wonders where the explosion is, and then the ground disappears underneath them and they fall into a dark hole as deep as an ocean abyss! Misty heard screaming. Tracey wonders why anybody would be screaming. Suddenly, the ground starts to crack and it collapses right underneath them, and they too fall into a hole as deep and dark as an ocean trench!

Ash and Misty woken up by Pikachu and Togepi, but Tracey is stuck in some rubble. So Ash, Misty and Pikachu pull him out. The Group look down the cave, all stand up and start to walk down the cave. As Ash and friends walking trough through sewer a bell-ringing sound is heard somewhere. Then, a mysterious plant somewhere comes into the water and taps on Ash shoulder. Ash believe thinking that Pikachu touch it and begs him to stop. But Pikachu is not on shoulder, instead, he's on the ground in front ofhim. A huge vine appears and the groups sees this. He commands Pikachu to use ThunderShock, but Misty states that Pikachu uses an electric attack will get all shocked shocked. So Ash decided to uses Bulbasaur. He commands it to use Razor Leaf, but the creature hits the leaves away, and then grabs Bulbasaur and pulls it into the sewer water! Ash attempts to jump in after it, but Misty, Tracey and Pikachu hold him back. Tracey points out that he will be dragged down too, but Ash does not care and still attempts to jump in to save him, As they they struggle for a while, and Officer Jenny comes in with a light up near him Jenny explains that the sewer is very dangerous and throws a rope down to them. But Ash refuses and still ident to find Bulbasaur, so Misty and Tracey tie him up and Jenny then hoists him.

Ash and Friends are thrown in jail and Ash bangs on the cell door. Misty and Tracey wonder why they were thrown in jail for walking in the sewers. Jenny comes in inform them they are free to go. Then a large man with a large mustache enters, and hopes that Jenny is not releasing them. Jenny then acknowledges the Mayor of Trovitopolis's presence. She tells him that they only arrived in town today and are going to the Pokémon Gym on Trovita Island, and that their story checks out. The Mayor can't have this incident leaking out yet and says she should keep them locked up until the next week. Jenny tells him that she can't hold them if they aren't charged with a crime. The Mayor has to accept that because it is the law, but he forbids them to say anything about the creature. But Ash begs Major that all he wants to get Bulbasaur backk. This makes Major loses his temper and threatens to have them all arrested for endangering public safety. Jenny reveals to them that they are not the first people to have seen the creature. The Mayor is reluctant, but Jenny tells them anyway. She reveals to them that the police force has had a number of reported encounters with a mysterious creature reaching out of the sewers, but no serious injuries reported. She then tells them that the Mayor says the people will panic if the word gets out about the creature, because they will never be able to capture it. Ash asks why, and Jenny reveals that there are almost 500 miles of sewer under the city, and over 5,000 manholes. The Mayor then says that is why they have to take drastic and immediate action to ensure the safety of everyone in the city. He also says that the city election is next week and if word gets out that he is letting a monster run amok then he will be ruined and never voted back into office. Nurse Joy comes in and tells him that she has heard what he intends to do about the sewer creature problem. The Mayor tells her that is his business, and group ask Nurse Joy about his plan. She tells them that instead of capturing the creature so it can be studied, the Mayor intends to send a SWAT team down to the sewers to destroy it. Ash and Misty and Tracy respond by saying the Mayor's plan is cruel and that it could be a whole new species of Pokémon. The Mayor says that any talk of any such plan is pure speculation, and that there is no proof. Jenny tells him that such a plan is illegal and the police force don't know anything about it. The Mayor loses his temper again and proclaims that he is the Mayor, he is responsible of the city and he will do what he sees fit for the city.

At Pokémon Center, the group speak Professor Oak about new species Ash asks Oak what they should do, and Oak says that there has to be some way of preventing the Mayor from exterminating the creature. Nurse Joy does not think so, because the only thing the Mayor cares about is being re-elected, and he's not going to let anything get in his way. The group see dozens of campaign posters all over building walls and park fences, and see a statue of the Mayor. The group notice "M" symbol on the foundation of the statue, and recognize it from all the campaign posters they saw earlier. Ash deciced that it had enough and decieded to back on sewer to search Bulbabsaur. The group finds that Mayor are order his SWAT Team inside the sewer. Ash knows how to find an entrance to the sewer.

Nurse Joy gave them a another entrance to the sewer on the other side of the sewer. Meanwhile, Team Rocket ends tired after fell off at the beginning of the dead. All Meowth wants eat, but James says there is nothing to eat down where they are. They hear the same bell-ringing sound, and the creature re-appears and starts rubbing Meowth's chin. Meowth mistakenly think that was a Jessie or James rubbed him, but find that they didn't rub him. The creature appears and Them Rocket run away in panic. Team Rocket ends exhausted again. They then hear footsteps, and a being with a flashlight points it at Team Rocket. James sends out his Weezing and commands it to use SmokeScreen, as it engulfs the sewer with smoke. Team Rocket then make their getaway, screaming in fear. It turns out that Ash was holding the flashlight and Misty and Tracey are there too. Ash asks if everyone is alright, then Misty notice Togepi is missing. They spot Togepi at the end of the path. Misty chases after it, and she picks up Togepi. The creatures appears and grabs Togepi and pulls him on the sewer water! Misty tries to water to save him, but Ash and Tracey pull her. Ash decided to use his secret weapon he asked Professor Oak to send Muk. Muk then Body Slams Ash in affection.

Meanwhile Team Rocket have exhausted seconds times. Jessie and James decided to use a scary disguise, Jessie split her huge hair at 2 ends and Meowth biting onto James's head. They then come across none other than the Mayor's SWAT team. The Squad Leader radios in to the Mayor, and tells him that they have discovered 3 unidentified creatures. The Mayor compliments them on their excellent work, and commands them to attack immediately. The SWAT open fire at Team Rocket with puddy guns, running away in the process.

The scene cuts back to Ash and Tracey, with Muk in front. They come to a dead end, and Muk points out that they have to go into the underwater tunnel to find Misty, Togepi and Bulbasaur. Ash and Tracey jump in and swim down the tunnel and they reach the end, where the Creature appear and attack Ash and Tracey!

The SWAT team has come out of the sewer and reported back to the Mayor. They tell him they couldn't find a creature that matched the original description, but found 3 other creatures down there. The leader comes to the conclusion that the sewer could be infested with freaks like the ones they saw. The Mayor grows increasingly paranoid and orders that every manhole to be sealed and seal off the sewer.

The group wakes up and sees an opening into the city. They find Misty and Bulbasaur. Tracey found the creature who actually is, Bulbasaur, in the twice its normal size form. He has been living down for long and was acutally using Vine Whip. Ash notices that it has the Mayor's "M" symbol on it.

Back at Mayor's office in City Hall, Nurse Joy explain him why sending his personal army of his to seal up all over the city. She explain that the group are in Sewer and whill trap there if Sewer system is sealed. The Mayor assures Joy that he will remove all the concrete as soon as the election is over Later, while Mayor is taking on the bath, an earthquake starts, then water forcefully erupts from the floor right under the Mayor's bathtub. The entire bathroom and the City Hall fills up with water and floods the entire town. Ash asks if the giant Bulbasaur looked familiar to him. He sees his trademark "M" initial on Bulbasaur's collar. Seeing of his memory. The Major explain that he abanoded his Bulbasaur in the sewer because he wasn't evolve. Upon learing this, Major's Bulbasaur grab him with Vine Whip. Misty and Tracy explain them how dare he abadoing him and was happier to see him. A bunch of people are seeing the Mayor half-naked, the Major begs his Bulbasaur to let him down. But the group begs him to Apologize his Pokemon for what he done. The Mayor's SWAT team arrives order's them to open fire at him. However, Ash steps in and commands Pikachu to use Thunderbolt to them and commands his Bulbasaur to use Vine Whip on them, which sends the SWAT team flying off. The Mayor begins that he will offers a truce with his Bulbasaur, but Bulbasaur spins him around and sends him into the air as well. He lands on his own statue's.

In the end, Joy will take care of the giant Bulbasaur at the Pokémon center. Joy points to the Trovita Island on Pokémon Gym in the Pokemon Gym is on, which is almost far away.

Meanwhile, Team Rocket has found an exit from the sewer system. Bit it has been bared up by the city and they realize they are trapped there. But Jessie sneezes and breaks the metal bars, setting them free.

Major events

  • Ash temporarily adds Muk to his team. It is implied that he returns it to Professor Oak at the end, but it isn't shown.
For a list of all major events in the anime, please see the timeline of events.


Pokémon debuts



Dare da?


Who's That Pokémon?

Who's That Pokémon?: Zapdos (U.S. and international), Bulbasaur (Japan)


Pikachu surfing
  • Professor Oak's lecture: Pikachu's Rescue Adventure: Oak talks about the then-upcoming second Pikachu short, to be released July 17, 1999 with the second movie. He explains that new Pokémon will be seen, specifically Elekid and Bellossom, as well as "others".
  • In the scene where the group falls into a hole and begins walking through a tunnel leading to the sewer, a revamped version of the music played in Pokémon Red, Blue, and Yellow while inside Mt. Moon can be heard.
  • Similar to Bulbasaur's Mysterious Garden, this episode features a Bulbasaur and has the word "Mystery" or "Mysterious" in the title, alluding to its Japanese name.
  • Pikachu can be seen riding its famous pink surfboard in one of the scenes.


  • After Ash, Misty, and Pikachu pull Tracey out of the rock, he thanks them and realizes that he's sitting on top of Ash. But when Tracey was freed from the rock, it shows Ash falling away from Tracey and he falls on to the ground rather than Ash.
  • When Tracey presents the "monster" to Ash and Misty, a back shot of the Bulbasaur shows it without its blue collar. Seconds later, it's seen wearing it in a full shot.
  • The straps on Tracey's backpack are painted orange instead of black when the monster first attacks.
  • When Misty finds Togepi, the blue triangle symbol on its shell disappears.

Dub edits

In other languages

EP101 : Get Along, Little Pokémon
Original series
EP103 : Misty Meets Her Match
Project Anime logo.png This episode article is part of Project Anime, a Bulbapedia project that covers all aspects of the Pokémon anime.