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Young Sherlock Season 1

Season 4

Season 4 follows Sarah, the de facto leader of the pack, as she reluctantly leaves a secluded Icelandic refuge to pursue a shadowy ally linked to Beth Childs—the clone who sparked the entire conspiracy. Tracking Beth's trail, she is drawn into a perilous alliance with a formidable new adversary, steering the narrative into a terrifying new trajectory. Under constant pressure to safeguard the sisterhood and keep everyone safe, Sarah's long-buried habits resurface. As the tight-knit clan is pulled in divergent directions, Sarah finds herself alienated from the very relationships that once transformed her.

201610 EpisodesDrama, Sci-Fi & Fantasy

Cast & Crew

Kristian Bruun

Kristian Bruun

Donald 'Donnie' Hendrix

Jordan Gavaris

Jordan Gavaris

Felix 'Fee' Dawkins

Tatiana Maslany

Tatiana Maslany

Sarah / Cosima / Alison / Helena / Rachel

Maria Doyle Kennedy

Maria Doyle Kennedy

Siobhan 'Mrs. S' Sadler

Josh Vokey

Josh Vokey

Scott Smith

Ari Millen

Ari Millen

Mark / Rudy / Miller / Ira

Kevin Hanchard

Kevin Hanchard

Detective Arthur 'Art' Bell

Episode Guide

After a two-month respite, Sarah's hard-won sanctuary in Iceland is shattered by a Neolution attack. Once again forced to flee, she realizes that no matter how far her family runs, it will never be far enough.

Season 4 FAQs

The cast of Season 4 includes Kristian Bruun as Donald 'Donnie' Hendrix, Jordan Gavaris as Felix 'Fee' Dawkins, Tatiana Maslany as Sarah / Cosima / Alison / Helena / Rachel, Maria Doyle Kennedy as Siobhan 'Mrs. S' Sadler, Josh Vokey as Scott Smith, Ari Millen as Mark / Rudy / Miller / Ira, and Kevin Hanchard as Detective Arthur 'Art' Bell.