Calwyn Shurgold

Sarah fights for her life on the Island and tries to stay strong enough to rescue Cosima; Cosima and Delphine reunite.

When Cosima admits doubts about finding a cure in time to save her life, Sarah makes a dangerous decision that puts her family at risk. Meanwhile, Art and Felix team up to protect naïve clone Krystal Goderitch from herself.

After losing communication with Cosima, Sarah's alliance with Rachel ends; Sarah lures a high-level Neolutionist into a trap.

Alison's loyalty to the clones is questioned; Cosima makes a final attempt to discover a cure.

Rachel gives Sarah an ultimatum, and her decision causes a clash with Kira; Felix brings an old ally into the mix.

Mrs. S. and Sarah set out to investigate a lead on a Neolution defector; an unexpected reunion takes place; Cosima has a terrible discovery.