"Iron Man" is a song written and performed by the English heavy metal band Black Sabbath, released on their 1970 album Paranoid. The lyrics tell the story of a man who time travels into the future and sees the apocalypse. In the process of returning to the present, he is turned into steel by a magnetic storm. He is rendered mute, unable verbally to warn people of his vision of impending destruction. His attempts to communicate are ignored and mocked. This causes Iron Man to become furious, and drives his revenge on mankind, causing the apocalypse seen in his vision.
Upon hearing the main guitar riff for the first time, vocalist Ozzy Osbourne remarked that it sounded "like a big iron bloke walking about". The title became "Iron Man", with Geezer Butler writing the lyrics around the title. Osbourne sang behind a metal fan to get the sound effect in its first line, 'I am Iron Man!'. Despite the title, the song has no connection to the Marvel Comics character of the same name, although it was used in the end credits of the 2008 movie Iron Man and the trailer for the 2010 sequel, Iron Man 2.