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Mark Hennesy is a fictional character portrayed by Greg Warkentin in the TV series 21 Jump Street.
They appear in 1 episodes out of a total of 102 aired

Mark Hennesy

by Greg Warkentin

character

Episodes1

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    Low and Away

    episode S1.E10 june 1987
    Penhall and Hoffs go undercover to protect a student that is in the federal witness protection program.