Transitory Sacrifices of Crisis (S03E02)

Castor is on a mission to secure original tissue samples from the Leda clones. Meanwhile, Helena, who is pregnant and locked away, undergoes examination by an enigmatic new antagonist. The Castor brothers also engage in a dangerous game with a terrified young woman named Patty, leading Sarah and Art to pursue the brothers. However, the fun quickly turns dark as Sarah discovers that the Castor boys might be harboring a hidden flaw that threatens their very existence.