The All Starz arc
In the American BBA Research Center, Kate as well as Kai refused Emily's challenge because Kate was suspicious of her, Judy and Chris. She and Kai realized that the Americans were only collecting some information about the other Bladebreakers. Kate also invaded the BBA laboratories along with Max, Tyson, Kenny and Ray. She showed that she had a great ease when passing through traps or while breaking passwords, and she only said to the boys that her ability was a gift.
As the Bladebreakers got a free day after visiting the Research Center, they decided to go to the Liberty Statue. Chris appeared there because he was suspicious of the espionage ability that Kate had. He was accusing her of being a professional spy and then Kate decided to battle against him. Kai advised her that it was probably just a trick to collect information about her, but Kate was so angry that choose taking the risks. But the battle finished in draw and both beyblades got broken.
When Mr. Dickenson gave the Bladebreakers the instruction to train with Antonio in an isolated area he also told Kenny to help Ray and Kate reconstructing their beyblades. And this way Drangifer Frost and Driger Fang were made. Drangifer got so strong in the new beyblade that it froze the lake when Kate called it.
Before the finals of the American championship, Kate fought just once. It was against Ethan from the Savage Slammers because Ray lost the match against Diego. Ethan told Kate how he got his beyblade when he defeated a shark using a swordfish, and Kate was feeling really impatient, but she defeated the boy by freezing the water of the bowl.
Even without fighting, Kate was always supporting her friends. As an example, she helped Max defeating Luiz from the Spintensity by giving him some dance tips since she liked ballet as her mother did. After all, battling as a team was not being as bad as Kate thought it was. She was even having fun when eating pizza with hands. The only thing she still could not get used to was Tyson's bad habits when he was eating, as well as his farts while he was sleeping. But in general she was doing well as a member of a team. Kate frequently was thinking about what her European friends would be doing and how she would like to tell them her experiences of working as a team.
Kate and Kai were already good friends, and he used to talk more to her than to any other Bladebreaker. Tyson used to say that it was because she was a girl but Kate preferred thinking that it was because both of them had the "Russian thing" in common. However she and Kai were getting each day closer, and the boy was happy because Kate was the only one who made he feel comfortable when being with. It looked like Kai knew her for years.
In the American championship finals, Kate battled against Steve in the first match. She won by faking her fighting style and then mistaking the All Starz when they were collecting information about her new beyblade. Ray lost his battle against Eddy, Tyson won his against Chris and finally Max defeated Michael. And then the Bladebreakers became also the new American champions.