Episode 9 of Orphan Black‘s second season, “Things Which Have Never Yet Been Done” airs tonight and we’ll get to see the aftermath of Cosima’s illness as well as Donnie’s antics.

Last week on ‘Orphan Black’

Not only did we get a new clone, Tony Sawicki, but Alison and Donnie made major strides in their relationship as they bonded over the murders for which they’re both guilty. Alison and Donnie will have to cover up Leekie’s murder while Sarah and Delphine argue over how to save Cosima, who’s now sicker than ever before.

Meanwhile, at the DYAD, Ethan Duncan revealed to Rachel he can save Cosima with the synthetic genome sequence, but he needs a few things to unlock it first. He also revealed that the clones were barren by design, and Sarah was actually a failure for being able to produce Kira. Now, Rachel wants to fix his mistake.

This week, a cure might be coming

Cosima is still suffering from her illness, but everyone is trying to find a way to save her. While Duncan is working on the synthetic genome, Delphine hopes to use Kira’s bone marrow to reboot Cosima’s immune system.

While the science side of the clone club is working on that, Alison will be dealing with Donnie’s mistake while Helena deals with the Proletheans, who are looking to impregnate her with the embryo they’ve successfully fertilized with Henrik’s sperm.