Dragon Ball Z - episode 86 - 09 Apr, 1991

Goku has entered the battlefield stronger than ever and prepares to fight Frieza alone. It seems that Goku might become a Super Saiyan, as he easily deflects Frieza's energy attacks. As Vegeta taunts Frieza, claiming that Goku is the "real Super Saiyan", the tyrant easily finishes him with an energy beam to the heart and a cruel bout of laughter. With his final breaths, Vegeta tells Goku of what Frieza has done to the Saiyans and begs Goku to defeat Frieza. After burying Vegeta, Goku prepares to fight Frieza, whom no one has beaten yet. (Source: Wikipedia)