The Enemy Within (タカオVSカイ友情の戦い, Takao VS Kai - Friendship's Battle) is the forty-ninth episode of Beyblade: V-Force.
Tyson confronts Zeo over stealing Dranzer, but once again he states that he is determined to win an that Dragoon will be his.
Impressed, Tyson wants Max to focus on the battle so that they don't lose but he comes off harsh on is partner and Hilary throws her bag onto his head to make him realize he shouldn't mistreat his own partner like that.
Meanwhile, Kenny studies Kai and Zeo's match and discovers his laptop had the same interference problem it had when Zeo was facing Ozuma. Kenny then makes an astonishing discovery and takes it to Mr. Dickenson, who is also shocked by the news, though they remain unrevealed to the viewer.
Kai, racked with guilt over the loss of Dranzer, decides to quit Beyblading. Hilary tries to change his mind but Kai is determined to never touch a Beyblade again.
All alone, Tyson visits the Beystadium where he will fight the final match of the Beyblade World Championships. He has a vision, he sees his friends and teammates and begins to realize what they mean to him.
Suddenly Kai appears and forces Tyson into a Beyblade battle hoping that he will stop doubting himself and focus on his important match with Zeo. The rest of the Bladebreakers show up and witness the battle. Tyson realizes that with his friends by his side he can win the championship again.
- Tyson begins to lose sight on Beyblading after Zeo has become ruthless, but everyone manages to keep him in line.
- Kai Hiwatari
- Ray Kon
- Zeo Zagart
- Blader DJ
- Mr. Dickenson
- Tyson Granger
- Max Tate
- Hilary Tachibana
- Queen (vision)
- Ryu Granger (vision)
- Tyson Granger (Dragoon V2) vs Max Tate (Draciel V2) = Tyson & Dragoon
- Ray Kon (Driger V2) vs Max Tate (Draciel V2) = No Outcome
- Tyson Granger (Dragoon V2) vs Kai Hiwatari (Dranzer V2) = No Outcome
- The part where Hilary throws her bag onto Tyson's head is not shown in the English dub.