The Fate Of The Eternals
Recently, rumours started appearing about the possibility of an Eternals movie coming out as part of Phase Four. This was somewhat confirmed by Feige himself. Seeing as the Eternals are the species that Thanos belongs to, we were expecting to see some sort of set-up for this in Infinity War. And, as it turns out, we actually did get a few hints at the Eternals’ society.
Chiefly, Iron Man’s team traveled to the devastated planet of Titan, which was once inhabited by Eternals. With the help of a vision of the world in happier times created by the Reality Stone, Thanos explained that the once affluent planet ran out of resources due to its ever-growing population. In an attempt to avert this, he’d suggested wiping out half of the population. This was obviously rejected, leaving the Mad Titan ostracized from his own people.
The film doesn’t clarify if Thanos is a Deviant, as in the comics – a mutant strain of the humanoid Eternals noticeable for their disfigured appearance – but it does namecheck his father A’Lars. If you’ll recall, Red Skull identifies him as “Son of A’Lars” when they meet on Vormir. So, this suggests that Thanos’ comic book backstory is intact in the MCU. Whether the Eternals movie would explore it or not, though, we don’t know.