Siobhan Cahill is known for Horizon Line (2020), How to Get to Heaven from Belfast (2026) and Mary Shelley (2017).

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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

Sinéad Keenan, Roisin Gallagher, and Caoilfhionn Dunne in How to Get to Heaven from Belfast (2026)

Siobhan Cahill

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