Captain America: The Winter Soldier (2014), The Avengers: Age of Ultron (2015), Captain America: Civil War (2016)
Wanda Maximoff (also known as Scarlet Witch) is a mutant with telekinesis abilities and able to case spells or hexes. Her father is Magneto and her twin brother is Quicksilver. She and her brother have be contained in a HYDRA underground laboratory facility.
Scarlet Witch joins the Avengers after the battle with Ultron.