Dragon Ball - episode 36 - 28 Oct, 1986

Goku enters the second floor of Muscle Tower and defeats the guards waiting for him. He heads up to the third floor where he finds a large android named Major Metallitron. Goku and Major start to fight, and after a few hits, Goku knocks him over. Goku is caught off guard when the giant gets up and grabs him. Major launches a missile at him, but he dodges it. Goku counters with a Kamehameha wave and blows Metallitron's head off. The android still moves though. Goku punches a hole through the robot's chest, but even that doesn't stop him. The fight finally ends when Major Metallitron's batteries die. (Source: Wikipedia)