AceShowbiz -

"Orphan Black" has finally moved from Sunday. The critically-acclaimed drama series will air every Thursday at 10 P.M. on BBC America, beginning April 14. Along with the premiere date, the first trailer for the new season has been released.

It features new clone MK, played by Tatiana Maslany, who has been featured wearing a sheep mask in previous teasers. It also sees a desperate Cosima, Sarah in some dangerous situations and Rachel at a house where she reunites with Susan Duncan.

In the fourth season, Sarah returns home from her Icelandic hideout to track down an elusive new ally tied to deceased clone Beth, whose identity Sarah stole in the series' first episode. With the stakes higher than ever before, Sarah and her sisters band together to uncover the missing chapter of the clone conspiracy - following Beth's footsteps into a dangerous relationship with a potent enemy who holds the key to their survival.

Co-creator John Fawcett told Variety last year that season 4 would revisit the vibe of season 1. He said, "I want a lot of that paranoia back, and Sarah following a first-person mystery, and a feeling of not knowing where we stand again, and having the audience not know where we stand."