It’s been 8 years since Project LEDA was destroyed for good, but all is not well.

Cosima suggests something unthinkable after Charlotte's discovery, and Vivi faces a disaster in the lab.

Ex-cop Art Bell gets an unwelcome visitor, Cosima learns what GRIT had been up to, and Vivi digs deeper into her lookalikes.

As Vivi gets closer to the truth, the sestras convene an emergency Clone Call, and Charlotte makes an outrageous proposal.

Clone Club discovers they've been infiltrated, Charlotte makes a shocking discovery, and Cosima finds herself in hot water.

Sarah meets Vivi, Charlotte's condition worsens, and one of Clone Club's worst fears becomes reality.

The worst has happened; now the real fallout begins.

Kira begins to understand the magnitude of what has been unleashed.

Alison and Donnie's undercover mission takes them to tantalizing places and Vivi talks to the sestras.

Art's in danger, Charlotte makes a revelation, and Vivi confronts the weapon developer.

Cosima and Delphine confront the real mastermind behind it all.

In the aftermath of their exposure, the Sestras face backlash from anti-clone protesters and newly aware clones alike. Meanwhile, Cophine considers sharing a secret.

Blythe Winston-wellness guru and clone-shares her vision with Vivi. Cosima is ambushed on live TV, but gets help from an unexpected ally.

Alison and Donnie have a close call filming their reality show. Felix is presented with a surprising opportunity.

Sarah's investigation into clone disappearances points her in only one direction. Blythe begins to reveal her real agenda.

Two couples struggle with their new dynamics. Helena hits the open water. Vivi and Felix make a disturbing discovery.

Charlotte reckons with her role in shaping the future. Donnie looks to Kira for help. A devastating disappearance rocks the Clone Club.

With all hands on deck to find one of their own, the search converges around Blythe's island.

Donnie learns that the road to hell is paved with good intentions. Rachel joins the fight.

Helena attacks. Cophine makes a momentous decision. Clone Club goes on the offensive.

The Sestras take the fight to Blythe, and the lives of all clones change forever.