|This article belongs to the Classic Timeline|
In the episode Vengeance of Vilgax: Part 1, Vilgax - who had previously arrived on the planet - managed to defeat Ultimos. With this, Vilgax conquered T.K., although, in the process, the planet was left in ruins. This is one of the 10 worlds that Vilgax has conquered along with Vilgaxia and 8 other unknown planets.
T.K. is the tenth and last planet that Vilgax conquered by defeating his best fighter: Ultimos. At first, he decided to attack it by his troops, however he decided to apply one of the rules of the Galactic Code of Conduct, which was that the defender of the planet would fight with the conqueror in a duel to the death (conquest challenge), in which, if the winner was victorious, the world would belong to the winner. In this case, this planet happened to be conquered, because Ultimos lost the duel against Vilgax, therefore it now belongs to him.
- Ben 10: Alien Force Volume 7 DVD; file