Who plays The Gray Man's Sierra 4? Meet actor Callan Mulvey

The Gray Man hosts a trio of Hollywood actors on the front line but fans are curious to know who portrays Sierra 4.

Who plays The Gray Man's Sierra 4? Meet actor Callan Mulvey

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Who plays The Gray Man's Sierra 4? Meet actor Callan Mulvey

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Callan Mulvey - IMDb

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Callan Mulvey - IMDb

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