"Knockout" is the debut single recorded by the British pop/rock group Triple 8, released on 21 April 2003 in the United Kingdom.

Before the single was released for download, Super Junior 05 made their debut as a group on SBS's Popular Songs on November 6, 2005, performing "Twins (Knock Out)".

A majority of the scenes are simply dancing footage, where the members are surrounded by fire and also the contrast, blue sky.

[5] Studio Personnel Taiwanese boy band Energy soon released a Chinese remake of the song several months later as "Retreating Dark Files" (退魔錄).

Unlike the original song which was a hip hop-influenced pop single, "Retreating Dark Files" is more rock influenced.