John Poston is known for Carnival Row (2019), Crossing Lines (2013) and The Musketeers (2014).

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Get a closer look at some of Hollywood's perfect pairs.

Hollywood Power Couples

Get a closer look at some of Hollywood&#39;s perfect pairs.

"The Gentlemen" and "Slow Horses" return this fall, while the "Reacher" spin-off series "Neagley" makes its debut. See our guide of the biggest Fall TV and streaming releases.

2026 Fall TV and Streaming Watch Guide

&quot;The Gentlemen&quot; and &quot;Slow Horses&quot; return this fall, while the &quot;Reacher&quot; spin-off series &quot;Neagley&quot; makes its debut. See our guide of the biggest Fall TV and streaming releases.

Get a closer look at these actors from their many TV and streaming series roles.

Streaming Stars, Then and Now

Prison Guard / Cell Block Guard / Constable #1

Donald Sutherland, William Fichtner, Marc Lavoine, Gabriella Pession, Tom Wlaschiha, Richard Flood, and Ibilola Rossi in Crossing Lines (2013)

Tom Burke, Santiago Cabrera, Luca Pasqualino, and Howard Charles in The Musketeers (2014)

John Poston

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