Ash, Brock, and Dawn are walking with Johanna and are enjoying the Twinleaf Festival. Suddenly Barry runs into Ash. Barry challenges Ash to a battle and tells Ash that he will be entering the Pokémon battling event. As the two run off to have their battle, Johanna tells Dawn to go with them, and she runs off after them. Then Sayer shows up and tells Johanna that one of their booth salesman have gotten ill, and that they are one salesperson short. To help solve the problem, Brock offers to run the stand for him.
The scene turns to Barry's Heracross and Pikachu are battling. Pikachu starts with a Quick Attack but Heracross is able to block it. Then it uses Megahorn and hits Pikachu. As the battle continues Barry notices a Xatu flying over. Dawn looks it up on her Pokédex and Barry runs off following it with Ash and Dawn in pursuit. As they catch up, they see a big tent up ahead with a Grumpig, a Mr. Mime, a Seel and an Alakazam are outside doing circus tricks and the Xatu they've followed is standing on the rooftop. Barry tells Ash and Dawn that the tent used to be a part of the festival. A clown comes out of the tent and invites them in the tent which he says "it connects the past, present and the future".
Ash wakes up alone in a field of tall grass. He stands up and sees a Nidoking and a Nidoqueen. Ash wonders why they are so big then a big group of Combee fly over. An Aipom runs up a tree and they are all bigger than normal. A Skorupi walks by along. Then a pack of Mightyena appear and they chase Ash who runs away and falls down a hole. As he gets back out a Natu runs by and Ash climbs out of the hole to follow it.
The scene moves to Dawn who is standing along a riverbank, calling for Ash, Barry and Piplup. A Fearow flies in the sky and a Magikarp and a Feebas jump out of the water. They are all bigger than usual. She sees a Natu hop by and looks it up on her Pokédex. She wants to send her Pokémon out but her Poké Balls are not working.
This time, the scene shifts to Barry sitting on the edge of a cliff, watching groups of oversized Tauros, Sandslash and Dodrio graze. He spots a Natu and follows it.
Brock is trying to run his booth and lets out his Pokémon to help him. He begins to play the games, but no one approaches. Team Rocket is watching people play their Goldeen scoop game, but no one can catch one on their net. Jessie gets mad when one of the kids say the game is rigged but James stops her from doing anything. Then a man walks up and grabs one of the nets. James observes him and informs them that the man may be the famous Goldeen Scoop Master.
Once again, the scene shifts to Ash walking through the forest and sees an oversized Rattata running past him. Then he accidentally steps on a Spearow's feather which begins to follow him but is taken out by Pikachu, who is also larger than normal. A group of Spearow show up and Pikachu takes Ash onto his back. As it starts to rain, the Spearow have already reached them and Pikachu stops, dropping Ash down. He uses Iron Tail and Thunderbolt to get rid of them. After the battle is over, the rain ceases.
Meanwhile, Dawn is attacked by a group of Ariados which use their strings and trap her in their web. Then Piplup shows up and breaks the web with his BubbleBeam. He then catches Dawn and together they leave. The scene returns to Brock and his Pokémon standing at their booth with nothing to do. At the other booth the Goldeen Scoop Master has caught a large number of Goldeen. James intervenes and challenges the Master.
The scene shifts to Ash riding Pikachu who both spot the same Natu as before. Ash remembers the Xatu from the rooftop of the tent and orders Pikachu to follow it. On the other side, Piplup is swimming in the river with Dawn on his back. They spot the same Natu and begin to follow it. The scene reverts to the contest between James and the Master. Both are at the last Goldeen but the Scoop Master's net rips and James wins the challenge. Due to the excitement of the challenge, every viewer offers to take a shot.
The scene is back once again to Dawn and Piplup following Natu. Suddenly they bump into Ash, Pikachu, Barry and Heracross who were both following the same Natu. Then, the Natu creates an illusion of the Tent and summons a Camerupt. Ash and Dawn attack the Camerupt but it takes no damage. Then Barry comes up with the idea that they should hit it on the rings on its side. Heracross fires a Double-Edge and one of Camerupt's craters erupt. Piplup fires a BubbleBeam and the other crater erupts. Pikachu finally uses Thunderbolt and Camerupt sends out a large explosion.
They all then find themselves back outside the tent and find Xatu flying above them. Barry follows it again but eventually bumps into somebody, who was actually Tower Tycoon Palmer, and also Barry's Dad. The scene temporarily turns to Team Rocket being congratulated by Sayer and then back again to the group along with Palmer. He explains them about their encounter with Xatu from before. They all come back to the festival and Dawn asks Barry how he thought of hitting the rings on Camerupt.
The scene returns to Brock, still without customers on his stand, exclaiming how bored he is.
- Professor Oak's Pokémon lecture: Castform.
- Professor Oak's lecture returns after a 10 episode hiatus. Interestingly, it returns one episode after Professor Oak makes an appearance in the anime.
- Palmer makes his debut appearance exactly 100 episodes after Cynthia made hers. Coincidentally, they both made cameos in Arceus and the Jewel of Life battling each other, and they shared the same battle music in Pokémon Diamond and Pearl.
- This is the first episode featuring Barry where his Empoleon does not appear.
This episode aired the same week that Stopped in the Name of Love! aired in America. Both episodes had a scene where Dawn and Piplup had to deal with a group of Ariados, which also occurred in Following a Maiden's Voyage!, when Dawn and Piplup became friends.
- The dub title of this episode is a play on The Beatles song and album, "Magical Mystery Tour".
- During the flashback of when Barry caught his Heracross, he was wearing a straw hat. In a flashback in The Ties that Bind, Ash was wearing a similar straw hat. In both flashbacks, both Ash and Barry were beginning Pokémon Trainers, and trying to catch Pokémon (Ash was fishing, and Barry was slathering Honey on a tree).
- Team Rocket doesn't blast off or recite their motto in this episode.
- Nidoqueen's lower jaw is colored blue instead of cream.
- In one scene, the Poké Ball symbol on Dawn's hat is darker than it should be.
- In that same scene, one of Dawn's yellow hair clips is missing.