The line comes from He-Man and the Masters of the Universe, the Filmation cartoon that ran from 1983 to 1985. Voiced by John Erwin, Prince Adam holds aloft his Power Sword and calls on the power of Grayskull before transforming. The catchphrase became one of the most quoted moments of 1980s children's television and later found a second life online in memes, remixes and reaction edits. Its earnest, over-the-top delivery still works because audiences instantly recognise the transformation, even when the video itself is completely unheroic.