Thanos tries to take advantage of the degringolada that happened among the Avengers after the events in Captain America: Civil War and arrives on Earth to collect the famous Infinite Rocks to use for the special glove with which he can control reality at his own liking. In order for this to not happen and Thanos can not implement the plan that would destroy the entire universe, the Avengers will need the help of the Galaxy Guardians. Thanos was born Titan, Saturn’s moon, being the child of Eternals Mentor and Sui-San. Thanos has Devian genes and took over the physical appearance of the Eternals, so that at birth his mother was terrified of his physical appearance and tried to kill him.
At first Thanos was a pacifist, but things changed when he reached adolescence and became fascinated by death and nihilism, worshiping and ultimately falling in love with the physical embodiment of death … The Deathly Halloween. Wanting to impress the Deathly Halloween, Thanos has formed an army of aliens who have done evil, and begins a siege by killing millions of his own. Seeking universal power in the form of the Cosmic Cube, the next stop of Thanos is the planet Earth, where it will be greeted by the Avengers and the Guardians of the Galaxy!