Mark Alexander Knox (born April 15, 1970), better known as Flex Alexander or Flex, is an American actor, comedian and dancer. He began his career while appearing on numerous of television sitcoms before portraying single father Flex Washington on the UPN sitcom One on One (2001-2006). Alexander also had a number of roles in many films including Modern Vampires (1998), The Force (1999), Out Cold (2001), Book of Love: The Definitive Reason Why Men Are Dogs (2002), Gas (2004), Snakes on a Plane (2006), and Trigger (2020).

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