The Demolition Boys arc
In the Demolition Boys arc, Kate was acting strangely in Russia, especially when the Bladebreakers visited the abbey. There, Boris was making her feel very uncomfortable because he was always staring at her. Kate also showed to be not happy when Tyson wanted to fight against some of the training kids. She tried to help Alexander during the battle by whispering some gentle words to him in Russian, and the kid was confused about why she was helping him. However no one of the Bladebreakers had noticed it. When Alexander lost the match and Boris destroyed his beyblade, Kate went away after some monks appeared to take Alexander of there. She said that would be waiting for her friends outside, and as Kai was feeling as uncomfortable as her, he got out of the abbey soon after. Outside, Kate hugged Kai and he started calming her.
When Kai had the nightmare about Alexander, who calmed him was Kate. He told her that the abbey seemed very familiar to him and that he wanted to understand why. Kate looked to be very worried with Kai and told him to avoid going to the abbey again since it was a dangerous place. Then they hugged each other and Kai said that even knowing Kate just for some months, it looked like if were years.
Kate was in the square with the other Bladebreakers, the White Tigers and the All Starz. She was very worried since Kai disappeared, and he only left her a message saying that he would be back soon. They had not met after the hug and she couldn't stop thinking about what he said earlier. Ray noticed that Kate was too quiet and asked her why she was feeling sad. But suddenly Kate realized that Kai could be in trouble and went away from the square without saying any word.
In the abbey, Kai remembered he trained there when he was a kid. He was very scared and his memories were slowly coming up to his mind.
Kate also invaded the abbey to look for Kai. Boris was using the speaker to provoke her. He said that Kai accepted being part of the Biovolt Corporation, but Kate refused to believe and kept running through the corridors, passing through several kinds of traps. While she was running she saw Alexander in a cell and used her beyblade to save the kid. He was very injured since he had been tortured after being defeated by Tyson. Kate then put him in her back and started running again. The boy was scared, but also he was feeling comfortable since he was not alone anymore then.
Kai was also running through the corridors, trying to find some way to get out of the abbey. He was having a lot of confusing flashbacks of his childhood. He was very dizzy but for some strange reason he was feeling attracted by that place. However it was when Kai found Black Dranzer that all his past came up to his mind. And he got really shocked about what he discovered.
Kai had trained in the abbey indeed, but he was not the only one. Kate also was there when she was a child, and they already liked each other in that time. Kate was his very first love and he didn't recognize her even when they were in the same team. Kai was extremely confused and at the same time he was feeling mistaken by the girl, since she always knew the truth about his past and never told him anything. Then Boris appeared and made Kai remember of the accident he provoked when he invaded the laboratory to test Black Dranzer: part of the abbey exploded and Kai only was alive because Kate saved him from the fire, but the boy lost his memory, and his grandfather took him back to Japan. Kai so realized that Kate didn't got her burn scars when her house caught fire, but when she saved him of the explosion he caused. That is why she got incommoded when he saw the scars in Robert's castle. Boris kept offering Black Dranzer to Kai, and saying to him that he needed to return to the team he left behind. Kai was very attracted by that beyblade, especially because he was feeling mistaken and alone.
When Kate along with Alexander finally found Kai it was too late. Kai was already possessed by the power of Black Dranzer. Kate tried to convince him to give up of that insane idea but he was angry with her. Kate was incredulous and said that Kai had no idea how she got destroyed when she went to the infirmary room to visit him after the accident and when he woke up he didn't know who she was anymore. Boris was laughing at that situation and invited Kate to also return to the abbey team. As she refused he called Spencer and Bryan and then they took Kate and Alexander away from there. Kate promised Kai that would save him again.
Outside the abbey, Kate saw that the other Bladebreakers went there to look for her and Kai, but they were in trouble with Ian, Vlad and Tala. When Kate saw the red-haired Russian she went from sad to serious, and they kept staring at each other with angry eyes. So she started yelling at the guy, trying to understand how he couldn't realize that the Demolition Boys were being mistaken by Boris, who was only using them as weapons. Tala called her silly and defector, and she said that their parents would be ashamed of his decisions. Kate and Tala were siblings, twin siblings. The Bladebreakers got confused, since Kate never mentioned that she had a twin brother neither that he was a world champion. As Kate saw that would be impossible convince the Demolition Boys that they were being mistaken she left the abbey along with Alexander and the other Bladebreakers, who kept asking her about Kai. But they noticed that something was wrong because Kate was with a tear in her eyes.
While Kate was nursing the wounds of Alexander, she told the Bladebreakers the truth about her past. After the death of their parents she and Tala were left in the abbey, which was an orphanage, since they didn't have any another close relative. They began to train there with the other orphans; however Kate could never get used to that cruel training system. Kate also told that some months later that she and Tala were left in the abbey, Kai arrived to train there too and they became very close friends during the years they passed together. But one day Kai provoked an explosion in the laboratory when he theft the Black Dranzer. As he fainted because he couldn't control the bit beast, he would have died on fire if Kate hadn't appeared to save him. She got some scars in the process, but the worst part about the accident was when Kai woke up and he didn't recognize Kate anymore. He had lost his memory because the power of Black Dranzer was too much for him. Kate got so sad that she ran away from the abbey, leaving her own brother behind. She and Tala had not a good relationship anymore because Tala became an aggressive person due to the abbey training system. Actually, Kate was also feeling betrayed by him, since he let Boris manipulate Wolborg, bit beast which Tala had inherited from their mother. So Kate ran away and started traveling alone through Europe to begin a new life without Kai and Tala, and there she met Robert and the other Majestics, for whom she told everything about the abbey, even about her relationship with Kai. That was why Robert didn't trust the boy: he thought Kai was the guilty for Kate's scars and also for making her sad. Kate also told the Bladebreakers that Kai got possessed by Black Dranzer again, and they were shocked with that entire story. Alexander was happy that Kate rescued him from the abbey and he told her that he would like if she were his mother, words that made Kate feel better.
Max realized then that Kate knew how to pass through traps and break passwords when they invaded the American BBA Research Center because she learned spy techniques in the abbey. She confirmed the theory and also said that it was why Chris thought she was a professional spy, because she really had been trained by militaries.
During the days Kai passed with the Demolition Boys, Kate along with the Bladebreakers tried to bring him back to normal several times, without success. She was with Tyson when they invaded the abbey to look for the boy, and Boris told them about the Biovolt Corporation plans. Tyson was shocked but Kate seemed to already know the story. Kate was also proud of Tyson when he said that would never let Boris achieve his objective. When Kai appeared Kate tried once again to bring him back to normal by only talking to him, but she failed. So Kai threw Dranzer to Tyson and he nominated Kate as the new captain of the Bladebreakers. At this moment Kate realized that the only way to save Kai from Black Dranzer was fighting against him.
It was at Baikal Lake where the Bladebreakers could finally confront Kai. Kate used Dranzer at that battle and Kenny was surprised on how the girl could control that bit beast even when she had never used it before. Tyson said it was because not only Kate, but also Dranzer, were missing Kai and they were united trying to bring him back. After the Bladebreakers defeated Kai and saved him from drowning, he realized how mean he was being and apologized. Kate also apologizes for not telling him about their past, but he wasn't angry anymore. Actually, he got happy to know that he already knew Kate before the Bladebreakers. He understood why he always felt comfortable by her side.
At the hotel, Kai told that he used Black Dranzer for the very last time when he destroyed the abbey laboratory after the battle at Baikal Lake. Kate got very proud of his attitude. As the Bladebreakers asked Kai what they would do then, Kai only looked at Kate and said that he was not the captain anymore, and the girl smiled at him. At this moment Dickenson appeared with Alexander, who Kate left under the BBA president cares, and the Grangers. Tyson got shocked when he saw that her father already knew Kate.
Dickenson told the Bladebreakers about the BBA plan to destroy Boris and the abbey. He also told that Kate knew about it all the time: he went to Robert's castle to invite her to help BBA, since he knew that she also wanted to destroy the abbey and save her brother and the other orphans. Kate got really upset with the invitation because she was having a good and happy life with her European friends. However she decided to go to Japan to help BBA because she thought it was the right thing to do. Robert and the other Majestics got very sad with Kate decision, but they understood her point and let her go. In Japan, Dickeson told her that her mission was observing Kai, because it was his grandfather who was the leader of the Biovolt Corporation. And that was why she became a Bladebreaker even when she used to fight alone. She was really like a spy. But she didn't expect to fall in love with her target again. The Bladebreakers, especially Kai, got very shocked with the explanation but soon they understood Kate's point and promised to help her saving Tala and the other orphans.
When the Bladebreakers along with Dickenson, Alexander and the Grangers were returning to Moscow, they were attacked by the Demolition Boys. While Max was fighting against Ian, Tala appeared and punched Kai for his betrayal, for Kate's despair. Tala and Kai were also friends in the past and Tala never accepted the fact that Kai was hanging out with his sister by his back. After Spencer defeated Max and caught Draciel, the Demolition Boys said that their main target was actually Kate. The girl realized that she was in trouble and started running, but she was being persecuted by Tala and Vlad. Kai, Ray and Tyson avoided Ian, Spencer and Bryan of chasing Kate too by fighting against them. Kate stopped running and also started a fight against Tala and Vlad at the same time. Alexander appeared and bite Tala's arm in order to help Kate, but Tala only got angrier. Kate was about to lose Drangifer when Johnny, Enrique and Kai appeared from nowhere to rescue her. Kai told that Robert, Oliver and Martin had also appeared and that they were helping Tyson and Ray against the other Demolition Boys. Boris called his team back after that.
The Majestics were taking the Bladebreakers and the other ones to Moscow by their bus. Tyson was very aggressive, as well as Kate and Ray. Max was sad, and Kai and Kenny were worried. In the abandoned mansion, Kate was desperate because it was the place where she lived with Tala and their parents. She didn't want to go to the ruins but as the bus was broken she got no choice. Inside the ruins Robert, Johnny and Oliver were provoking Kate, Tyson and Ray, and then they started three simultaneous battles. All of the Majestics won the first round. They were saying that the Bladebreakers needed to control their emotions in order to defeat the Demolition Boys. Robert, during his fight against Kate, said to her that they were in that house because he wanted to show her that she needed to stop seeing Tala as a brother and to start seeing him as an enemy. Kate needed to stop thinking about the past she had with Tala and their parents, and so think about the good future she could have with Tala if she saved him from Boris' hands. Then Kate, Tyson and Ray learned how to control their anger and all of them won the second round against the Majestics. Kai was grateful to Robert and both of them were proud of Kate and the other two Bladebreakers.
In the finals, Kai lost his match against Spencer and also he lost Dranzer. But all of the Bladebreakers were proud of him because he didn't use the Black Dranzer and Kate greeted him with a kiss. Ray won his fight against Bryan but lost Driger when the bit beast protected him from Falborg's attacks. Both Tyson and Kate had their beyblades improved by Kenny, Emily, Chris, Judy and Taro for their matches. Tyson's fight was against Vlad, and Tyson won the match when he overcharged Vlad's beyblade in the high voltage wires of the bowl and so it exploded. Vlad didn't cheat in that battle because he was suspicious of Boris. The day before the next match, Kate was training with Tyson and Kai in the forest when Michael, Lee and Robert also appeared because Kai called them to help her. Kate so decided to fight against the five guys at the same time just to practice, and for everybody's surprise she really won the battle. Tyson was incredulous about how a girl could defeat five guys at once.
Kate's match against Tala was the most intense battle of her whole life. She won the first round, but in the second one the collision between Drangifer's and Wolborg's ice powers made her and Tala got trapped in a giant iceberg. Kate lost the second round when Tala used all the caught bit beasts against her. Kate was trying to convince Tala that he was being mistaken, but the boy was so possessed by the power of the mutant Wolborg that he couldn't even listen to her. As Robert said, she needed to defeat Tala in order to have her brother again by her side, like when the Bladebreakers defeated Kai at Baikal Lake. During the last round Tala was so confused about Kate's determination that he lost the control of Wolborg. The bit beast almost killed Kate with an ice attack, but she was saved by Dranzer, which also escaped of Tala's control. Kate smiled when she realized that it happened because Kai was caring about her outside the iceberg. She had saved him from fire and then he saved her from ice. For some reason Tala also was worried with Kate, and then Draciel and Driger also started fighting along with Kate, Drangifer and Dranzer against Wolborg. Soon all the other caught bit beast escaped of Tala's control too. And so Kate won the fight by gaining the loyalty of the bit beasts. And Tala finally realized that he was being mistaken and controlled by his ambitions. Boris, Voltaire and the abbey were finally destroyed.
Mr. Dickenson and the BBA assumed the control of the abbey and he said that they would change all the training system of the place. Dickenson also said that now the Demolition Boys would also receive his help in their training. Kate was very happy because Tala wasn't under Boris influence anymore, however the twins still were very shy when talking to each other. Kai was also happy because of his memories, and he and Kate were closer than ever. Kate wanted to travel around the world because she was tired of her spy life and Kai invited himself to go with her. The girl laughed and accepted the idea.
All the Bladebreakers were very excited about everything that happened in the past months. And this was how an amateur team became the most powerful one in the whole world.