Sum and Substance is a compilation album released by the British rock band The Mission on February 7, 1994 through Vertigo/Phonogram Records. It contains all the singles released by the band as well as two new songs, the 2LP version had a slightly different track-listing. A remix of Tower of Strength by Youth preceded the release, while a second single 'Afterglow' coincided with it. A VHS video with all the music videos produced by the band was also made available. The Mission played the 'Recon '94' tour around the UK in support of the album. The record was their last for Phonogram Records.