Santtu Sierilä is known for Dark Floors (2008), Apeiron (2013) and Private Eye Vares (2004).

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"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

Mr. Lordi and Skye Bennett in Dark Floors (2008)

Juha Veijonen in Private Eye Vares (2004)

Mikko Leppilampi in Hautalehto: Kylmä syli (2021)

Santtu Sierilä

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