Ash and friends are traveling when a Zangoose runs up in front of them. It is followed by its Trainer, their old friend Nicolai. Ash challenges Nicolai to a Pokemon battle.
The battle is being watched by Team Rocket. Jessie sends out her Seviper (to catch Pikachu), but Zangoose senses it and the two Pokemon start to fight. They fall into the river, and Ash sends Corphish to drive Seviper off, so they can rescue Zangoose.
While the injured Zangoose is recovering back at their camp, Ash shows Nicolai how to battle Seviper. Team Rocket returns and the battle between Zangoose and Seviper continues. James and Meowth steal Pikachu while Jessie is helping her Seviper.
The friends go to get Pikachu back, but James' Cacnea accidentally sends Pikachu flying. Wobbuffet grabs Pikachu and runs off, trailed by everyone.
Nicolai notices that they can't catch Wobbuffet because it's running in a zig-zag pattern, so he instructs his Zangoose to do the same to avoid Seviper's attacks. Zangoose then uses Crush Claw to win the battle, while Pikachu uses Thunder to send Team Rocket blasting off again.
Nicolai congratulates Zangoose, and Ash and Nicolai continue their battle.
- This episode aired exactly one year in Japan before it was aired in America, along with Maxxed Out!.
- This is the first episode to explain Zangoose's and Seviper's arch rivalry.
- In this episode, for the second time, Meowth fills in for Jessie in the Team Rocket's motto.
- Once again, Ash and Nicholai's battle is cut off at the end of the episode, leaving the outcome a mystery.
- In Pokémon Trainer's Choice, all three choices are actually correct. Dewgong's Ice-type is effective against Ninjask's Flying-type, Torkoal's Fire-type is effective against Ninjask's Bug-type, and Nosepass's Rock-type is actually effective against both of Ninjask's Bug/Flying-types, which would theoretically make Nosepass the most effective choice.
- When Meowth starts to say the motto with James, both of them act like it is the first time this has happened. However, this has happened before, in The Stun Spore Detour.
- At the beginning of the battle between Nicholai and Jessie, the lower left fang on Nicholai's Zangoose suit disappears for a moment.