William Brandt is a major character in the action spy film series Mission: Impossible. He is one of the three deuteragonists (alongside Jane Carter and Benji Dunn) of Mission: Impossible - Ghost Protocol and one of the two tritagonists (alongside Luther Stickell) of Mission: Impossible - Rogue Nation. Brandt is an IMF agent, who was forced to work with fellow IMF agent Ethan Hunt after the Secretary of the IMF is killed. Brandt had known of Hunt before their mission and had been assigned a mission to protect Hunt and his wife, Julia Meade.
During his mission one day, Brandt followed Hunt for a run, leaving two agents to guard her. He returned to find the agents unconscious and Julia gone. Three days later, what was left of her apparent body was found.
Brandt aided Ethan to succeed in his mission to retrieve nuclear launch codes from Kurt Hendricks and accepted his next mission from Ethan after it was revealed to him that Julia's death had been faked by Ethan to protect her.