The Other (Marvel Cinematic Universe)

"The Tesseract has awakened. It is on a little world, a human world. They would wield its power, but our ally knows its workings as they never will. He is ready to lead, and our force, our Chitauri, will follow. The world will be his, the universe will be yours. And the humans, what can they do, but burn?"

- The Other to Thanos in "The Avengers"

The Other is the leader of the Chitauri, a race of aliens, and serves as the tertiary antagonist in The Avengers, alongside his ally, Loki, and his master, Thanos. He reappeared in Guardians of the Galaxy as the quinary antagonist in the film but gets killed by Ronan after Ronan wanted to shut him up.

The Avengers (2012)
The Other stays on the alien home world, telling Thanos that the universe will be his once he has the Tesseract, and in exchange Loki gains control of Earth. The Other also warned Loki that if he failed to give Thanos the Tesseract, Thanos would find him and punish him.

After the army of Chitauri was destroyed, the mid-credits scene revealed that The Other and Thanos survived, as their area was separate from the one that got blown up. The Other informed Thanos that Loki failed because the humans fought back, and weren't as defenseless as he had thought. He told Thanos that to fight them would be to "court death". At this, Thanos decided to take matters into his own hands.

Guardians of the Galaxy (2014)
In Guardians of the Galaxy, The Other called Ronan and Nebula over to Thanos's domain when Gamora betrayed them and the Orb was kept from them. Ronan argued with The Other, and raised his voice, to which The Other yelled at Ronan to lower his tone. In response, Ronan used the power of his hammer to twist The Other's head 180 degrees, killing him. Thanos took little notice of this.

Powers and abilities
The Other seems to possess super speed, which he demonstrates to run over to Loki at one point in response to him reminding him that they do not yet have the Tesseract. He also teleports Loki to the alien home world at one point. Not much of his power has been seen, however, as he is not seen in action as much and is original to the film series.

Trivia

 * In the comics, "The Other" was an alias of Chthon the Elder God. However, his appearance closely resembles that of Thanos' right-hand man, Corvus Glaive, also being very similar to Herr Kleiser from the Ultimate Marvel Comics series
 * He looks similar to the Flash Gordon villain Klytus.
 * He bears some similarities with the Mouth of Sauron and looks and sounds like Emperor Palpatine.
 * There are rumors that Thanos will revive The Other, though it is unknown whether Thanos has the power to do so.
 * According to James Gunn, The Other was killed so that Ronan, the main villain of Guardians of the Galaxy, would not look weak compared to Thanos.