Acting • AGE 56
Mark Alexander Knox (born April 15, 1970), better known as Flex Alexander or Flex, is an American actor, comedian and dancer.


Unrequited
Erik
2026

The Assistant
Shawn Fields
2023

The Black Hamptons
Devon aka Lojack
2022

Kenan
Derek
2021

Trigger
Michael Mass
2020

Ballbuster
Luther
2020

mixed-ish
George
2019

Maybe I'm Fine
Jeffrey
2019

Carl Weber's The Family Business
Low Jack
2018

Station 19
Evan Forrester
2018

And I Danced
Self
2018

Love by the 10th Date
Preacher Hill
2017

Lucifer
Simon Hallbrooks
2016

Soul Ties
Jessie
2015

My Sister's Wedding
Matthew
2013

Masters of Sex
Walter
2013

24 Hour Love
Bradford
2013

Gotham Comedy Live
Self - Host
2012

The Client List
The Wolf
2012

Blue Bloods
Demarcus King
2010

The List
Chet
2007

The Hills Have Eyes 2
Sarge
2007

Poor Boy's Game
Ossie Paris
2007

Snakes on a Blog
Self
2007

Snakes on a Plane: Meet the Reptiles
Self
2007

Snakes on a Set: Behind the Scenes
Self
2007

The Snake Pit: On the Set of 'Snakes on a Plane'
Self
2007

Love and Other Four Letter Words
Arnold
2007

Snakes on a Plane
Three G's
2006

Pure Venom: The Making of Snakes on a Plane
Self
2006

Her Minor Thing
Marty
2005

Grey's Anatomy
Evan Forrester
2005

Cuts
2005

Shira: The Vampire Samurai
Small Change Willie (as Flex)
2005

Man in the Mirror: The Michael Jackson Story
Michael Jackson
2004

Gas
Damien
2004

On Air with Ryan Seacrest
Celebrity Courtyard Correspondent
2004

CSI: Miami
Beau Lendell
2002

Out Cold
Anthony
2001

One on One
Flex Washington
2001

Girlfriends
Darnell Wilkes
2000

Santa and Pete
Pete
1999

The Apartment Complex
1999

The Parkers
1999

She's All That
Kadeem
1999

Modern Vampires
Trigger
1998

Ice
Kelvin
1998

Total Security
1997

Brooklyn South
Buster
1997

The 6th Man
Jerrod Smith
1997

City of Industry
A Roc
1997

Homeboys in Outer Space
Tyberius Walker
1996

Moesha
Dread
1996

Money Train
Hood
1995

New York Undercover
1994

Sister, Sister
Cold Dog
1994

Where I Live
1993

Juice
Contest Auditioner
1992