Unstoppable Force is the second album (and third release) from the US speed metal band Agent Steel. It was recorded at Morrisound Recording Studios in Tampa, Florida. The album was released by Combat Records in March 1987 and reissused in 1999 by Century Media with the four tracks from the Mad Locust Rising EP on the end.
There are a number of versions of Unstoppable Force. The original Japanese release contains the bonus track "The Ripper (Judas Priest Cover)". A certain re-release contains the song "The Unexpected (Live)" which was also a bonus track on the Skeptics Apocalypse album. This song has never been recorded in a studio and has only been performed and recorded live.