21st Century Supersister is the 25th single release by the British rock singer Toyah Willcox. Written by Toyah and collaborator Simon Darlow, it was featured in the 2011 film "The Power of Three" in which Willcox starred. The song was originally recorded for the 2008 album In The Court Of The Crimson Queen and was subsequently re-worked with new lyrics in 2011. Its original version was included as the b-side of the single and was added to the album for its 2013 reissue.