First full Orphan Black Season 3 trailer shows who the clones can rely on

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Mar 2, 2015, 6:08 PM EST

As we know from the last two seasons of Orphan Black, Sarah, our protagonist, is a clone with many "sisters." But in the last episode of season two, we learned she's not the only clone experiment: There's a group of male clones as well (played by Ari Millen). And in the first trailer for the upcoming season three, we're seeing more of them ... a lot more of them.

The minute-long trailer gives us more of a look at the male "Castor clones," who will act as a threat to Sarah in the upcoming season. According to BBC America,

After neutralizing the threat by the DYAD Institute (the company that monitored them)Sarah, Helena, Cosima and Alison (Maslany) are finally all united in their journey towards the truth of who and what they are. But new discoveries that include Helena’s kidnapping, a book that could contain the answers to their existence and the most shocking discovery of them all – a set of treacherous male clones with an unknown agenda – will test how tight their new bonds are… 

[Sarah and her sisters'] greatest threat is a band of highly trained soldiers – identical brothers dubbed Project Castor. Unlike the sisterhood, Mark, Rudy, Seth, Miller and others (Millen) grew up together, fully aware of who and what they are. Developed by the military, this wolf pack was raised as regimented clones – singular in thought, movement and allegiance. Hell-bent on kicking up dirt, they’re dispatched to tackle their mission from all sides. But differences in approach betray cracks in their armor, and may be the very thing the sisters need to escape their clutches.

But that isn't Sarah's only threat: It seems that her foster mother, Mrs. S., has made some choices that are coming back to haunt Sarah. And according to clone Cosima, "We can't rely on anybody but ourselves."

At least there are a few clones left to rely on. 

They're going to need more than self-sufficiency. From the flashes we've seen, it seems as if actor Millen is as flexible as star Tatiany Maslany--and a lot more menacing. Check it out: 

Orphan Black will be airing on April 18, 2015. Can't remember who's doing what to whom? Check out the four-minute catch-up video, released almost two weeks ago.