The Substance: Albert Hofmann's LSD (2011)
The Substance of Fire (1996)
The Substitute (1996)
Substitute (2006)
The Substitute (2007)
The Substitute 2: School's Out (1998)
The Substitute 3: Winner Takes All (1999)
The Substitute 4: Failure Is Not An Option (2001)
The Substitute Minister (1915)
The Substitute Wife (1925)