Kosme

Kosme is a Biosovortian from the planet Attracta which Ben fought first in Kosme's Bomb.

Story
Kosme is a Biosovortian who is the son of Aureax and Myranda. Aureax, Kosme's father, was a villain when Kosme was born, and so also became a villain, although Aureax's occupation changed and beacme a hero due to Coccus' betrayal. Despite this, Kosme still became a villain.

Ben first encounters him in Kosme's Bomb, after creating a bomb to aim to a star and create a black hole in the Galvan solar system. The plan was similar to that of Praxiss, who earlier also planned to bomb a star and create a black hole in The New Archenemy. Kosme was defeated later by Ben and sent to prison.

In Breakout, Kosme was freed by Praxiss and Gaxvil with Francisco's help, in order to find Aureax, as Kosme was the only one who knew his father's location. He also requested him to be part of their group. Praxiss needed to have Aureax's help as he had alien tech stolen in the past years. His goal was to defeat Coccus, the alien who traitored Aureax.

Kosme was not reluctant with Praxiss and Gaxvil, but with Aureax he was. While they had a feud, Kosme later agreed with him and joined to take Coccus out of office as president of his own planet.

In Tens Battle Pt. 1, Kosme becomes part of the "Tens", a group of ten villains reminiscent of Ben 10 vs. Negative 10, to try and defeat Ben once and for all. Kosme frees Lectro from the lightbulb in Sparksville, then later fights together with the other villains. However, Praxiss becomes on the side of Ben's and traitors them. Eventually, Kosme, together with the nine villains, were sent to the Null Void.

Inventions
Kosme was partly an inventor, as his smarts were obtained from Aureax's. He invented two devices:
 * The Helix Bomb - the bomb which he used in an attempt to obliterate the Galvan solar system.
 * Universal Translator/Speech Amplifier - an invention he connected to Lectro to make him speak English. At first, it was supposedly a universal translator; rather, it was actually a speech amplifier, specified only for screech language speaking aliens.

Appearances

 * Kosme's Bomb
 * Breakout
 * Coccus
 * Tens Battle Pt. 1
 * Tens Battle Pt. 2