Oh, brother.

The new trailer for season three of “Orphan Black” focuses on the male clones of Project Castor and their pursuit of the female clones played by Tatiana Maslany.

“While Dyad carried female clones to term, a military faction carried males,” the trailer explains of the mysterious Project Castor.

Ari Millen (“12 Monkeys,” “Reign”) plays the men of Castor, including Mark, Rudy aka “Scarface,” Seth and Miller. Unlike the sisterhood, the clone brothers grew up with each other, aware of their identities.

The Clone Club has already had an eventful week, with Hot Topic announcing an “Orphan Black”-inspired clothing line Tuesday.

“Orphan Black” returns to BBC America at 9 p.m. on Saturday, April 18.