Kang is a Rigellian from Rigel 7. He and Kodos continuously try to take over Earth and are usually seen attacking Springfield.
Kang & Kodos have a lot of space weaponry at hand and have their own spaceship. They speak the Rigellian language, which, by coincidence, is identical to English. Although they look identical, Kang has a deeper voice than Kodos.
In the game
In Bart's game, he was seen deffeated, when Bart made a tune on the threeangle and from that, Kang's head glass protector was starting to crush when it finally fell into pieces. Kang was strugling, because he didn't had the air that he needed and died.
In Homer's game, he was seen in a space shuttle with his sister Kodos. He asked her, how can she likes the Inka Games adventures, because they are always making fun of them. He then started to remember them both in the games they were feautred and they always end up dead. She then said, that this cannot go unpunished and that they need to teach them a lesson. Kang then said, that they will go to their planet and kidnap every single person who plays at inkagames.com. His sister then approves of doing so and both laugh.