Cathal O'Hallin is known for Vikings (2013), The Hole in the Ground (2019) and Come Back (2024).

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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

Jessalyn Gilsig, Alyssa Sutherland, Cormac Melia, and Cathal O'Hallin in Vikings (2013)

James Quinn Markey in The Hole in the Ground (2019)

Cathal O'Hallin

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