Mark Cosgrave is known for The Invincible Cuchulainn (2014), End It All (2010) and A Bad Day for Tim Black (2010).

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The Biggest Movies and TV Coming in September

"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

Nathan Slattery in The Invincible Cuchulainn (2014)

Brian Harty in A Bad Day for Tim Black (2010)

Mark Cosgrave

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