Kang and Kodos

Kang and Kodos are recurring antagonists from The Simpsons. They appear in the Treehouse of Horror series as occasional antagonists and commentators on the events of the episode. They are from planet Rigel 7, and speak Rigellian, which by pure coincidence, is exactly the same as English. Rigel 7 was one of the first planets in the Universe to be created by God.

Kang is voiced by Harry Shearer while Kodos is voiced by Dan Castellaneta.

Description
Kang and Kodos are green alien-like creatures. They come from the distant planet of Rigel 7. They possess a state of the art spaceship, from which they observe life on Earth. At one point, they got bored with watching a game of Baseball and sped it up to the point of accidentally destroying the entire Universe by sucking up all matter including the Earth and God into a massive black hole. They despise the Simpson family, along with all the other residents of Springfield, and eventually humanity. Sometimes such as in the comics, Kodos is shown as female, but in the first appearance, she is similar to Kang (despite the latter saying that Kodos is his sister).

Treehouse of Horror
In their first appearance, Kang and Kodos take the Simpsons aboard their spaceship with the alleged intent of making them comfortable. However, a suspicious Lisa uncovers a book about "serving man" (a reference to the classic Twilight Zone episode "To Serve Man"), only to be repeatedly corrected by blowing off dust from the cover, revealing it to just apparently be a cookbook of human foods, rather than of humans. Angered, Kang and Kodos dump the Simpsons back at their house, declaring that they now hate them and would have treated them like kings if Lisa hadn't regarded them with suspicion. If they are truthful, this could explain their resentment towards the Simpson family (and humanity) from that point on. Of course, Kang and Kodos are also shown to be treacherous, thus is unknown as to whether or not this would be so.

In several following Treehouse of Horror segments, Kang and Kodos are shown plotting world domination and attempting to pull it off. In "Lisa's Nightmare" of "Treehouse of Horror II", Kang and Kodos invade the Earth after Lisa wishes for world peace, thus leaving Earth susceptible to attack and conquering, until Kang and Kodos and the other Rigellians are driven away by Ned's wish to repel them. In a brief scene in "Treehouse of Horror VI", the two are shown attempting to hitch a ride to "Earth Capital", getting no luck.

Their most notable conquest occurs in "Treehouse of Horror VII" segment "Citizen Kang" wherein they forcefully abduct Homer and inquire as to who his world leader is. Homer informs them of the then-upcoming election between Bill Clinton and Bob Dole, leading the two to abduct the candidates and impersonate them. Homer manages to expose the two, but Kang and Kodos exploit the citizens' patriotic right of voting to manipulate them into voting Kang into office. The segment ends with the entire world enslaved to the Rigelians.

"Treehouse of Horror IX" reveals an unusual (and naturally non-canon) truth in that Kang is Maggie's true father, having inseminated Marge during an experiment (with a specialized ray gun apparently). He attempts to reclaim his daughter, only to be countered by the Simpsons. In revenge, Kang and Kodos set out to kill all the leaders in Washington, which the Simpsons (darkly, humorously) encourage.

A later attempt at world domination is seen in "Treehouse of Horror XVIII" segment "E.T., Go Home" where Bart encounters and befriends Kodos, who is only using Bart to get information regarding the planet's weaknesses. Nevertheless, Bart attempts to save Kodos's life, only to then be threatened as Kodos summons up a portal using a device made from ordinary objects. The portal brings in Kang and several Rigellians armed to conquer. Fortunately, they are stopped by the military that guns down all of them except Kodos who is smothered by Homer on a dissection/vivisection table.

Additionally, they do show signs of being man-eaters at points. In the introduction of "Treehouse of Horror XV", Kang and Kodos are shown preparing the Simpsons in a dinner for their boss. In a teaser for "Treehouse of Horror XXIII", they devour Krusty the Klown in a manner akin to Lady and Tramp eating spaghetti. The motif of the Season 14 DVD boxset for the series involves Kang and Kodos hosting a Halloween party at Burns' estate while attempting to kill the guests. The DVD's booklet has several thinly-hidden signs of this as well, such as "R.I.P" being altered to "R.S.V.P." and claiming that several human-eating slips (such as "meat" and "having you for dinner") are just "typos".

The Simpsons Wrestling
Kang and Kodos appear as bosses in the game that the player must defeat in order to progress. They fight with their standard ray guns.

The Simpsons: Hit & Run
Kang and Kodos serve as the main antagonists in the video-game "The Simpsons: Hit & Run". In the game, they are revealed to be the creators of an intergalactic reality TV show called Foolish Earthlings, focusing on the antics of the residents of Springfield. With the show's ratings plummeting, Kang and Kodos devise a scheme involving the distribution of a new and improved Buzz Cola, which is actually designed to drive it's consumers insane; after the townspeople have descended into madness, they will distribute free laser guns in the hopes of destroying Springfield and ensure huge ratings for their show.

After Bart destroys the laser gun stands set up throughout the Squidport, he and Homer travel to the Duff Brewery to confront them, but arrive just in time to see them fly off in the spaceship. Before they leave however, Kang and Kodos reveal that they have already distributed Buzz Cola into Springfield's water supply, causing the dead to rise from the grave and attack the town.

Homer sets out to stop the alien duo and comes across Professor Frink, who reveals that their weakness is nuclear waste. After sending four barrels of waste into their ship's tractor beam, Homer destroys the ship, killing Kang and Kodos in the process. Much to their confusion, they both end up in Earth Heaven following their deaths, and lament that despite that, their show has become a huge success (with Homer becoming a celebrity among the show's viewers. The two are then forced to sit through the game's credits, much to their displeasure

The Simpsons Game
Serving as the main antagonists of the game, Kang and Kodos use their technology to begin a raid on earth, leading several Rigelians to attack Springfield's citizens. In addition, they also bring up Treehouse of Horror villains, such as the dolphins of King Snorky and the rampaging Lard Lad statue, to fight. Although defeated, the aliens nevertheless continue causing destruction, which is finally resolved when the Simpsons get God to fix everything.

Trivia

 * Due to their treacherous nature, it is possible that Kang and Kodos were really planning on eating the Simpsons.
 * Kang and Kodos were named after two villains on the original Star Trek series.