Sarah and her clones are set to face the menacing clones of Project Castor.

The press release from BBC America reads:

"Season 3 plunges the clone sisterhood into unexpected territory with the realization that they're not alone. Just when they thought they knew their enemies and allies, season three reveals our clones are more vulnerable than ever before. Highly trained, identical male-soldiers raise more questions than answers.

Who are these new clones? Who created them? And more importantly, why do they exist? Sarah, Cosima, Alison and Helena are stronger together than they are apart, but this season will put that bond to the test. Will they forge towards their truth, or fall at the feet of those that seek to control them?"

The final episode of "Orphan Black" left the audience hanging seeing Helena being dragged to military custody and Sarah was unaware of the situation. It appeared that Sarah has no idea that her clone sister is in danger that made a lot of fans worried to Helena. Once Sarah realizes that Helena is in trouble, she will do the best she can to save her. However, those who nabbed Helena belong to Project Castor, which is a male cloning project speculated to be for military purposes.

Since the people who dragged Helena looked like Mark, it was hinted that Mark is a clone and is part of the project. There are speculations that he will play a major role in rescuing Helena with the aid of the Clone Club. According to rumors, Sarah will save Helena and will devise a plan to use Mark to sneak into the military base to save Helena.

Tatiana Maslany, Ari Millen, Jordan Gavaris, Dylan Bruce, Maria Doyle Kennedy, Evelyne Brochu, Kevin Hanchard, Michiel Huisman and Zoé De Grand Maison will all be back in the third season of "Orphan Black". BBC announced that "Orphan Black" season 3 has started filming for its come back in spring 2015.