'Orphan Black' season 4 spoilers, plot news: Sarah goes back to her old ways; Lead actress Tatiana Maslany speaks on Leda clone she relates to the most

Canadian science fiction series "Orphan Black" only has a few episodes left before its finale, and viewers will see yet another dark and emotional episode this week.
In this week's episode 7 titled "The Antisocialism of Sex," the complications of Cosima's decisions will finally catch up to her. News about Delphine will also trouble her. Alison will do everything to give her children the normal life they deserve while Donnie will come in contact with Neolution. As seen in the trailer, Sarah Manning will come out on the open to continue hunting down Beth Childs. Unfortunately, Sarah will also return to the old life she had before, and it might lead to further complications. The pressure of protecting the sisterhood begins weighing her down. Elsewhere, the clones will be in a bad state.
This could be the most emotional season of the series yet, as noted by reports. Sara and Kira's relationship was severely strained while Felix's story arc is deeply emotional as well. Cosima is currently in a depressed state as she still deals with the death of Delphine.
Lead actress Tatiana Maslany recently shared in an interview who the Leda clone she relates to the most. At first, she felt like she has more similarities with Cosima, but that changed as the show progressed. "Now, Sarah feels more close to me, Alison at times feels very close to me, Helena for different reasons feels close to me — I won't go into that [laughs]," she said.
The actress also admitted that Krystal is her favorite character at the moment. "But then I get to play Krystal who is so far from me but I'm obsessed with her," Maslany added. "I love her, she's so much fun. I would never get cast as that character, ever. So it's great to get to have that chance."
Stay tuned for all-new episodes of "Orphan Black" season 4 which airs Thursday nights on BBC America.