Governments of the world impose a system of accountability for the Avengers when their actions lead to collateral damage. After being confronted by a grieving mother who blamed the Avengers for her son's death, Iron Man (Robert Downey, Jr.) does everything in his power to make sure the oversight committee is enacted. Captain America (Chris Evans) wants superheroes to remain free to defend humanity without government interference. Not everyone agrees in the team agrees. They are divided in a Civil War.