The third season of "Orphan Black" may focus on two clone projects – Leda and Castor.

The official synopsis of the hit TV series hints that the clone projects will be one of the highlights in the upcoming season. 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?"

Based on this synopsis, the relationship of the clone sisters, Sarah, Cosima, Alison and Helena, will be put to the test. They will continue to search for the answers to their questions and to find the real reason behind their existence while they dive into a dangerous place of another clone project.

The new antagonist will be the newly-introduced Project Castor, which is deemed as a more militarized project than Project Leda. The big question is, who is behind the two projects?

There is a big chance that the female clones will infiltrate the facility of the male clones to save Helena. Moreover, Sarah will most likely seek the help of Mark, whose secrets and truths will be revealed.

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.