Originally, he plotted in the background, using minions to further his goals to retrieve the Infinity Stones, which would make him supreme ruler of the cosmos, although his plan is much more complex than simply taking over it, until he decided to take an active part after several failures from the Avengers meddling in his affairs, leading to an all-out war against them, resulting in his apparent victory in Avengers: Infinity War.
Physical and personality traits
He sees the universe being overpopulated, assaulting planets and cutting down their population in half. He had occasionally adopted an orphan and trained them as his personal warriors, which led his personal army of the Black Order. He is also the adoptive father of Nebula and Gamora, which led to a strained relationship, as the latter proved herself as a better warrior. But Gamora had always doubted Thanos's goal and joined the Guardians of the Galaxy to stop him in getting the Power Stone. Nebula also turned against him in regards to her treatment by him, while also attempting to kill Gamora, but the two were able to make things up.
- The Avengers (2012, cameo)
- Guardians of the Galaxy (2014)
- Avengers: Age of Ultron (2015, cameo)
- Avengers: Infinity War (2018)
- Avengers: Endgame (2019)
Total appearances: 5.
- For The Avengers, Damon Poitier was credited as "Man #1".
- Sean Gunn was an on-set stand-in for Thanos in Guardians of the Galaxy.
- In Agents of S.H.I.E.L.D., Thanos is the indirect reason Glenn Talbot becomes Graviton, with the last four episodes of season 5 taking place during Avengers: Infinity War, although ultimately, the effects of the film are completely ignored in the series itself, and vice versa.