By capturing Nebula, he used reverse-engineered technology to venture to the future and lay siege on the Avengers, as he decided to wipe out the entire universe and replace it. However, the arrival of time-traveling Avengers from 2023 alerted him about the events of the Infinity War and how it would end. To complete this goal, Thanos set about hunting down all the Infinity Stones, which combined could wipe out half the universe, being aided by the Black Order, composed of his adopted children. Thanos was a genocidal warlord from Titan, whose main objective was to bring stability to the universe, as he believed its massive population would inevitably use up the universe's entire supply of resources and perish. They will resist.' ―Thanos to the Avengers And as long as there are those that remember what was, there will always be those that are unable to accept what can be. 'I thought by eliminating half of life, the other half would thrive.