Orphan Black Season 4 episode 6 airs tomorrow night, and the plot thickens with the shocking events that happened in the previous episode. The upcoming episode's synopsis states that there may not be a cure for Cosima (Tatiana Maslany) after all. Meanwhile, Sarah will expose Kendall (Alison Steadman) to their enemies.

In episode 5, fans were left in shock as Cosima managed to get into the Brightborn facility and see a baby born with a deformed face. She was then confronted by Susan Duncan (Christy Bruce), who tried to convince her to surrender the original Kendall so they can conduct more experiments and find a cure for Cosima's illness.

According to Comic Book Movie, the synopsis for Orphan Black Season reads, "When Cosima admits doubts about finding a cure in time to save her life, Sarah makes a lone decision that exposes Kendall to those she's spent years hiding from. Meanwhile, Art and Felix team up to protect naïve clone, Krystal Godderitch, from herself."

Fans know that Cosima has long been struggling with her unknown disease and hasn't found an exact cure for it yet. However, as the synopsis of the upcoming episode suggests, there might not be a cure for her after all. Will she be the next clone to die in the series?

Cosima's death isn't likely, at least not anytime soon. As what Hypable previously pointed out in an article, the character is a fan favorite, and she also has a lot to do with the science involved in the story, so the series still needs her.

Meanwhile, Sarah's bold and lone decision of exposing Kendall in the upcoming episode may either help or destroy the clones. It's yet to be determined if Susan Duncan is to be trusted, and Dyad's possible involvement with Sarah and her sister again may prove to be dangerous.

More mysteries have yet to be uncovered in Orphan Black this season, as Krystal has yet to find out that she's a clone; the issue with MK has yet to be settled; Helena's whereabouts is yet to revealed; and so much more. Fans will surely enjoy a rollercoaster ride again with the series, just like what its creators promised.

Orphan Black Season 4 episode 6 airs at 10 p.m. on Thursday on BBC America.