Unforgettable, previously known as Species X, was a planned film which would be set in the Condemned Universe, as part of early plans to expand the franchise. It was announced in October 2005 prior to the release of Condemned: Criminal Origins. It was initially titled Species X, but in 2007 renamed to Unforgettable. In 2007 Kurt Sutter was hired to write the script.
It was planned for the Condemned series to feature different stories but set in the same universe. The film would have contained seemingly science fiction elements.
The film never went ahead and the only expansion to the Condemned storyline was the 2008 sequel Condemned 2: Bloodshot, which would be the final instalment in the series to date.