Orphan Black - Season 4 - Eps 9: The Mitigation of Competition
With Susan Duncan deposed, Sarah finds herself in the same position as Rachel — under the heel of a new HBIC — causing the archenemies to come together for the greater good. Cosima and Susan butt heads on the ethical implications of human experiments. Meanwhile, when the Hendrixes' legal counsel, Adele, further investigates Donnie’s case, she begins to suspect Felix is keeping deep secrets. Helena’s arrival forces Felix to make a difficult decision.
About Orphan Black

Title: Orphan Black
First Air Date: 2013-03-30
Last Air Date: 2017-08-12
Status: Ended
Rating: 7.804/10 (from 1283 votes)
Language: EN
Seasons: 6
Total Episodes: 50
Network: Space BBC America
Genres: Drama, Sci-Fi & Fantasy
Production Companies: Bell Media, Temple Street Productions, BBC America
Synopsis
A streetwise hustler is pulled into a compelling conspiracy after witnessing the suicide of a girl who looks just like her.
Cast

Tatiana Maslany
Sarah / Cosima / Alison / Helena / Rachel

Jordan Gavaris
Felix 'Fee' Dawkins

Josh Vokey
Scott Smith

Maria Doyle Kennedy
Siobhan 'Mrs. S' Sadler

Ari Millen
Mark / Rudy / Miller / Ira

Kevin Hanchard
Detective Arthur 'Art' Bell

Kristian Bruun
Donald 'Donnie' Hendrix