Sarah's (Tatiana Maslany) adoptive brother Felix (Jordan Gavaris) has seen enough troubles in the lives of the clones from Project Leda over the past season, which means that he knows what would happen to the girls in "Orphan Black" season 4. 

In an interview with Entertainment Weekly, Gavaris talked about what will happen to his character and the girls from Project Leda, particularly to his sister Sarah as well as her clones Cosima and Alison. 

"I think we probably get a little bit less than normal, but I think what's great about that is that we do get Felix and Alison, we also get Felix and Cosima, which has been a dynamic we haven't explored yet," the actor said, adding that they have much in common, primarily their state of loneliness. 

Gavaris also said that "Orphan Black" season 3 will be all about the interaction between Project Leda and Project Castor. 

"I think that this season is so much about getting answers to questions that we haven't had answered yet from season 1 and 2: Who is Leda? What's the purpose? Why Leda? Why Castor? Why all of this? And I think that finally we're going to get a couple of answers that I think is going to kind of satisfy the appetite of the audience," the actor said. 

Meanwhile, IB Times Australia reported that the third season of the sci-fi thriller drama will concentrate on the fight between the girls of Project Leda and the new set of male clones under Project Castor, all portrayed by Ari Millen. 

Apart from Maslany, Gavaris, and Millen, season 3 of "Orphan Black" will feature Dylan Bruce as Paul Dierdan, Kevin Hanchard as Arthur "Art" Bell, Maria Doyle Kennedy as Siobhan Sadler, and Évelyne Brochu as Delphine Cormier. The premiere episode "The Weight of This Combination" is slated to air on April 18 on BBC America as well as all AMC Networks.