Calwyn Shurgold

An injured Sarah is determined to stay strong enough to rescue Cosima, and journeys into the island's centre to discover a mysterious village.

With the siege reaching its climax, Helena decides to seek refuge behind enemy lines; Sarah and Art struggles to protect Helena and end the siege.

Sarah finds out that Helena has been kidnapped, and she must be found before her babies are born. The Clone Club bands together to find her.

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

Westmoreland wants more serious action directed towards Kira; Sarah battles to save her daughter; a secret is uncovered by Rachel; Cosima holds a clue that may help reveal Westmoreland's identity.

Mrs S orders the girls to celebrate Felix's art opening; Sarah remains suspicious that S is hiding something.