Orphan Black is in the home stretch.

'Orphan Black' Season 4: Teaser Reveals Delphine's Fate, EP Dishes On 'Tragic Love Story'

The BBC America sci-fi drama has yet to set a premiere date for season 4, but production is inching towards the finale. While we're all still wondering what the future holds for Sarah Manning (Tatiana Maslany) in the wake of "History Yet to be Written," writers are already devising Orphan Black's next big revelation.

Series creator John Fawcett took to Titter on Monday to update fans on the filming process.

'Orphan Black' Season 4: A Cure Coming For Castor Clones? EP Teases' Mark's Storyline

For the leader of the sestras, season 4 will be bumpy ride. Once Sarah return to Iceland to track down an ally connected to Beth Childs, a new enemy will turn her world upside down.

"Sarah will follow Beth's footsteps into a dangerous relationship with a potent new enemy, heading in a horrifying new direction," BBC America teased. "Under constant pressure to protect the sisterhood and keep everyone safe, Sarah's old habits begin to resurface. As the close-knit sisters are pulled in disparate directions, Sarah finds herself estranged from the loving relationships that changed her for the better."

Catch Orphan Black will return to BBC America this spring. Check out preview below!

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Orphan Black, Television, BBC America