Thanos is a mutant member of the race of superhumans known as the Titanian Eternals who rules over a dead dimension. He allies himself with the exiled Loki Laufeyson, providing him with the deadly army of the Chitauri, who will help him in conquering Earth, in exchange for the Tesseract, a powerful energy source.
When Loki has arrived on Earth, Thanos is contacted by him, and the Other warns the God of Mischief of the price of failure and reminding him to not question the will of the master, declaring that if he fails in defeating the Earthlings, Thanos will make him know a new kind of suffering.
When eventually Loki is defeated, the Other complains that the Earth's inhabitants are not as weak as they were supposed to be and declares that challenging the Earth's heroes would be to court Death. To this, Thanos simply smiles.
Sometime later, Thanos brokered a deal with his old ally, Ronan of the Kree, promising to lend a fraction of his forces in a genocide against the Xandarians in exchange for aiding in the search for the Orb. Ronan discovered the true location of the Orb on the planet Morag and attempted to deliver it to Thanos, but an unexpected turn of events ensued and the stone fell into the possession of human pilot Peter Quill and his allies. Unwilling to be denied another stone, Thanos ordered Ronan to pursue Quill and recover the stone, sending Nebula to aid the Kree in his pursuit.
Powers and abilities
As a Titanian Eternal, Thanos possesses abilities common to the Eternals, but amplified to a higher degree through a combination of his mutant Eternal heritage, bionic amplification, mysticism, and power bestowed by the abstract entity, Death. Demonstrating enormous superhuman strength, stamina, and durability, Thanos can absorb and project vast quantities of cosmic energy and is capable of telekinesis, telepathy and matter manipulation. Thanos is an accomplished hand-to-hand combatant, having been trained in the art of war on Titan.
Thanos is a genius in virtually all known fields of advanced science and has created technology far exceeding contemporary Earth science. He often employs a transportation chair capable of space flight, force field projection, teleportation, time travel and movement through alternate universes. Thanos is also a master strategist and uses a space vessel called Sanctuary II as a base of operations.
