Goku first transformed into a Super Saiyan in Dragon Ball Z during the battle with Frieza on Planet Namek, a turning point first aired in Japan in 1991. The golden hair, rising aura and raw scream became one of anime's most copied power-up images. Clips of the charge and yell later spread through forums, YouTube edits and soundboards, shortened into a standalone reaction for any sudden surge of strength. Its lasting appeal comes from that clear arc from struggle to release, understood even by viewers who have never seen the full fight.