Cast & creator
Flex Alexander
Best known for Grey's Anatomy, CSI: Miami, Blue Bloods
Mark Alexander Knox (born April 15, 1970), better known as Flex Alexander or Flex, is an American actor, comedian and dancer.
Also known as: Flex, Mark Alexander Knox
35
film credits
27
television credits
60
1992–2026 · acting roles
6.6
average across scored titles
Signature credits
Known for
Across film & television
Filmography (62)
Showing 62 of 62 credits
Grey's Anatomy
Evan Forrester
2005
CSI: Miami
Beau Lendell
2002
Blue Bloods
Demarcus King
2010
Lucifer
Simon Hallbrooks
2016
Station 19
Evan Forrester
2018
Girlfriends
Darnell Wilkes
2000
Sister, Sister
Cold Dog
1994
Moesha
Dread
1996
Masters of Sex
Walter
2013
One on One
Flex Washington
2001One on One
Producer
2001One on One
Co-Executive Producer
2001
New York Undercover
1994
Steve Harvey
Self
2012
The Parkers
1999
On Air with Ryan Seacrest
Celebrity Courtyard Correspondent
2004
Gotham Comedy Live
Self - Host
2012
Carl Weber's The Family Business
Low Jack
2018
Brooklyn South
Buster
1997
The Client List
The Wolf
2012
mixed-ish
George
2019
The Hills Have Eyes 2
Sarge
2007
Cuts
2005
She's All That
Kadeem
1999
Kenan
Derek
2021
Carl Weber's The Black Hamptons
Devon aka Lojack
2022
Snakes on a Plane
Three G's
2006
Money Train
Hood
1995
Homeboys in Outer Space
Tyberius Walker
1996
Total Security
1997
Juice
Contest Auditioner
1992
Where I Live
1993
Out Cold
Anthony
2001
Modern Vampires
Trigger
1998
The 6th Man
Jerrod Smith
1997
City of Industry
A Roc
1997
Love by the 10th Date
Preacher Hill
2017
Ice
Kelvin
1998
Poor Boy's Game
Ossie Paris
2007
Love and Other Four Letter Words
Arnold
2007
Man in the Mirror: The Michael Jackson Story
Michael Jackson
2004
The Apartment Complex
1999
Her Minor Thing
Marty
2005
Unrequited
Erik
2026
Santa and Pete
Pete
1999
Sweet Oranges
Himself
2004
Pure Venom: The Making of Snakes on a Plane
Self
2006
Snakes on a Plane: Meet the Reptiles
Self
2007
My Sister's Wedding
Matthew
2013
Snakes on a Blog
Self
2007
Snakes on a Set: Behind the Scenes
Self
2007
Ballbuster
Luther
2020
24 Hour Love
Bradford
2013
Shira: The Vampire Samurai
Small Change Willie (as Flex)
2005
Maybe I'm Fine
Jeffrey
2019
The Snake Pit: On the Set of 'Snakes on a Plane'
Self
2007
The List
Chet
2007
Gas
Damien
2004
Soul Ties
Jessie
2015
And I Danced
Self
2018
The Assistant
Shawn Fields
2023
Trigger
Michael Mass
2020