Ultraman Jack (ウルトラマンジャック, Urutoraman Jakku) is the protagonist of the 1971–1972 tokusatsu Ultra Series, Return of Ultraman. Sometime after Ultraseven's departure, Earth had entered a period of peace until a string of incidents wherein monsters awakened from slumber, appearing one after another. Jack bonded with the race car driver Hideki Go to save his life and as the former's means to operate on Earth while they joined MAT to fight against monster attacks and alien invasions.