The Marvel Cinematic Universe's Infinity Saga succeeded in weaving its intricate narrative through twenty big-screen movies that detailed the rise of Earth's mightiest heroes and detailed the existence of the powerful Infinity Stones. The Infinity Stones made appearances early on in the MCU in films such as Captain America: The First Avenger, The Avengers, and Thor: The Dark World .
Thor's journey to learn more about the Infinity Stones, which was ultimately fruitless, may have been excluded from the MCU for a few reasons. For one, it kept Thor occupied during Captain America: Civil War. With Wanda Maximoff far below her eventual power level at this point, Thor's presence would have simply been too much for the fight to remain close.
8 Thanos Acquiring The Mind Stone Despite being the narrative driving thread of the Infiinty Saga, there are several Infinity Stones that Thanos acquires off-screen. The first of these is the Mind Stone, which is embedded in the Scepter and given to Loki by Thanos. The official MCU hasn't given an answer, but a Marvel novel may give a hint.
While more of the Maximoff twins' backstories are revealed in WandaVision, no more focus has been given to Wanda and Pietro's time being experimented on by Hydra. Though the time has likely passed for this story to be told in the MCU, it's easy to imagine a dark, cerebral series showing the twins discovering and learning to control their powers in a Hydra base. Perhaps, if Scarlet Witch returns to the MCU, even more flashbacks will clarify her recent past.
4 Thanos Destroys Thor's Asgardian Ship After the destruction of Asgard at the hand of Surter in Thor: Ragnarok, the surviving Asgardians and their allies board a ship to find a new home. Shockingly, Avengers: Infinity War opens with Thanos and the Black Order having decimated the ship.