- Ash's Pikachu
- Rotom (in all six forms)
- Team Rocket A.K.A: Jessie And James and their Meowth
- Dawn's Piplup
- Dawn's Buneary
- Dawn's Pachirisu
Ash called Prof. Oak with the computer telephone in the Pokémon Center of Canalave City. Prof. Oak sees Ash's Grotle and Dawn's Piloswine. Prof. Oak tells him about the Gateau, which is made at the Old Chateau.
When Ash and co. get to the Chateau, a construction worker tells them about the Chateau being closed from the storm becuase now all the power is out, and then he tells Ash, Dawn and Brock about the rumor of the ghost in the mansion and he exaggerate the rumor with a scary face and frightened Ash and co. (also Dawn's Piplup).
Meanwhile, Team Rocket searches for the Gateau, James has found a candybar and hides it in the oven, afraid that his partner will eat it. When James is not looking, a Rotom enters the oven and eat the candybar. Next, Jessie then finds a candybar and hides it too, but the same Rotom eats it. Meowth finds a cookie and hid it in the same oven James put his candybar, but the Rotom entered the oven again and ate it.
When they are leaving the room, all of the three wanted to return to the room to get their food. Of course, they can't find their food. Team Rocket then blames the missing treats on each other. But when Team Rocket sees Rotom, Rotom attacks and they run away in fright.
When Ash and co. go in the mansion, Pikachu sees something moving and goes and looks. When Ash sees something weird, he follow Pikachu to a room. Pikachu wanders into a microwave that Rotom possesses it and Rotom tries to 'eat' Pikachu. Ash and co. rush towards the scene, seeing Pikachu eying at the object. Then when they are not looking, Rotom appears again. This time, Pikachu uses Thunderbolt and Rotom gets out of the machine and runs. Pikachu's Thunderbolt made the power back on.
When Ash and co. find the kitchen, Brock starts cooking and Ash starts training with Chimchar and Pikachu. When Pikachu accidentally shocks the lawnmower, Rotom possesses it and chases Ash. While Dawn is practicing with her Buneary, the fan starts blowing. Dawn notices it and turns it off. Then it blows again when Rotom possesses it. Ash and Dawn run to Brock to see if he is ok, but when they're running in the halls, Rotom changes to its lawn mower form and chases Ash and Dawn. Then, they notice Rotom's dryer form and it shoots water beams at them. Then they go in the elevator and go to the first floor, which by then the Fan Rotom attacks. When they get to the kitchen, they tell Brock what happened. Brock tells them that he finished the gateau. Rotom goes to fridge behind Brock. When Brock turns around the fridge, thinking is normal, so Rotom keeps doing it. When Brock sees him, he has a silly look on his face. Fridge Rotom attacks and then falls out of the its microwave form, revealing his true form and goes into lawnmower form, then dryer form, but then Pikachu attacks Rotom. Then, Rotom falls out of the dryer. It apologizes, does one more zap, then escapes in a streetlight. Team Rocket finds a Gateau, but it turns out its a fake wax. Ash and friends have the real Gateau with Ash saying, "This would make an old man cry," and now, they will go on another adventure in the next episode.
- In this episode we see Rotom in all six of its forms: Normal, Lawnmower, Microwave, Refridgerator, Washer and Fan.
- All letters in the title cards are capitalized, starting with this episode.
- This is the season 12 premiere.
- The location of the old mansion in the games is in Eterna Forest, not Canalave City.
- The room where Dawn, Piplup and Buneary were training looked very similar to the music stand room in "Steamboat Willies"