A movie extra was critically injured on the set of Transformers 3 today. The accident occurred during the filming of a stunt scene. Gabriella Cedillo was behind the wheel of an automobile in the scene, when an explosion sent an object barreling through her windshield. Cedillo was struck by the object and then rushed to Loyola Medical Center where she was listed in critical condition. Police say Cedillo was an extra not a stunt professional.