In The Avengers, Loki tried to mind-control both Hawkeye and Iron Man, but while he succeeded with Hawkeye, his attempts failed on Iron Man due to his arc reactor. Iron Man's arc reactor protected him from Loki's scepter, as the scepter needed to touch organic matter to work, and the arc reactor was not skin.
To that end, Wanda had willingly allowed Tony to make off with the scepter with hopes that his fear of letting the world die would lead to him constructing his own undoing, which in this case appears to be Ultron.
What happened to Loki's Scepter after Age of Ultron?
After the Battle of New York, the Scepter was confiscated by HYDRA, whose scientists used it to give extraordinary powers to the twins Wanda and Pietro Maximoff.
In The Avengers, Loki tried to mind-control both Hawkeye and Iron Man, but while he succeeded with Hawkeye, his attempts failed on Iron Man due to his arc reactor. Iron Man's arc reactor protected him from Loki's scepter, as the scepter needed to touch organic matter to work, and the arc reactor was not skin.
Well, doors open from both sides.” Just then, the Tesseract activated and opened a wormhole, allowing Loki (Tom Hiddleston) to reach Earth. Loki then stole the Tesseract and used his scepter to control the minds of Clint, Dr. Selvig and other S.H.I.E.L.D. agents.
Originally Answered: Why didn't Loki use the Tesseract against Thanos on the Asgardian ship? At the time, Thanos only had one Infinity Stone, and the Tesseract should have been able to hold its own against him, especially with the help of Thor and the other Asgardians. Simply because he doesn't know how.
Another theory, posted on Reddit, suggests that Thanos' real goal when he gave the Mind Stone to Loki was destabilizing Asgard so he could get to Nidavellir and have an Infinity Gauntlet made for him. Nidavellir is one of the Nine Realms, homeworld to the Dwarves, and the place where weapons like Mjolnir were created.
Thanos' plan was never about balance, no matter how much he protested. He was angry that people didn't recognize his "genius," and furious that they scoffed at his plan. The Snap was about punishing the universe, nothing more. Using the Mind Stone to subjugate people wouldn't have accomplished that.
Stark's resistance to the Mind Stone likely stemmed from the new element he created to power his arc reactor in Iron Man 2. Needing the new element to save his life, Tony uses Project Pegasus' resources for help, the same organization which was created to wield the Tesseract's power.
The simple answer is that Mjolnir was placed on top of the breastplate that Loki is wearing. It seems safe to assume that there is enough room between Loki's chest and his breastplate for him to breathe, as otherwise he wouldn't ever be able to breathe while wearing it.
Why couldn t Loki lift the hammer? Loki would never be worthy at this point: he was hateful towards his brother, sought vengeance, and had dark ambitions to oust his brother.
Wanda could not defeat Thanos, but she was able to stop the Mad Titan with one hand while destroying an Infinity Stone with the other. What Wanda did in Infinity War is even more impressive considering that Thanos had five of the six Infinity Stones in his gauntlet.
Because Stark missiles kill her parents and nearly kill her and her twin brother Pietro, Wanda spends much of her youth hating Tony Stark. Her initial ally, Ultron, plays off of that rage and manipulates the twins into working for him against the Avengers.
Wanda gets inside Tony Stark's head and pushes him to see his actions leading to the deaths of his fellow Avengers, and eventually allows Tony to take Loki's scepter (with the Mind Stone inside) for himself, believing that it will eventually lead to him driving the Avengers to their destruction.
Thanos kills half of the occupants and threatens to kill Thor as well, but Loki gives up the Tesseract in order to save his brother's life. Thanos proceeds to crush the Tesseract to acquire the Space Stone. He tells his children to acquire the two Stones on Earth.
Once he boards the ship and finds Loki alive on board he almost certainly knows his best bet for getting the Space Stone is Loki. So it isn't necessarily that he knew Loki had the Tesseract, it's that he knew Loki was the most likely to have it.
He has feats such as defeating Surtur (who can destroy a planet), conquering the 9 realms, and sealing away Hela. While there isn't much doubt that Thanos could beat Odin if he had all 6 stones, Odin could probably defeat Thanos if he only had one or two of them.
What if Loki didn t take the Tesseract in Endgame?
If Loki had left the Tessaract, the Tessaract would break, but the space stone would drift for anyone to take it among the debris. The stones are linked you have one, you can easyer find the other once. Thanos and probably also Maw could sence Loki had it.
So there's a reason Thanos took so long to do his plan. He waited for several people to die. For one, Odin. Odin in the MCU's universe is stronger than Thanos.
Was Loki sick in the Avengers? It looked like he almost fell a couple times. He looked sick because of the effects of the Mind Stone within the scepter.
A simpler explanation is simply that the watch is valuable and highly sought after, and Fisk wasn't interested in acquiring the watch via a purchase, so he sent his men to a black-market auction to steal it.
In the comics, Hawkeye adopted the Ronin identity at one of the darkest times of his life. In the modernized Ultimate universe, just as in the MCU, the trigger was the death of his entire family. Hawkeye turned into a Punisher figure, seeking out criminals and murdering them in his own form of justice.
