On Batwoman Season 1 Episode 17, Alice settles into Arkham while Kate is suffering from the effects of killing Cartwright. An old villain terrorizes Gotham's heroes.
Alice's fantasy of hanging out with Kate is shattered by Dr. Butler's goal to electroshock her into reality at Arkham.
Batwoman is suffering panic attacks from her memory of killing Cartwright whenever she's in her Batsuit so she stops responding to the Signal. Copycat Batwomans are getting injured trying to be heroic.
The Detonator returns to Gotham, strapping bombs to victims and making them choose between saving their own life or saving others. His first victim caused Gotham International Bank to blow up.
At Arkham, Tommy Elliot is part of the therapy group Alice and Mouse attend. Alice notices he has a shiv and provokes him into stabbing her so that she gets sent to the infirmary.
Kate questions a suspect but he confesses that his father was The Detonator but he died seven years ago.
The Detonator's second victim is Bobby Reeves, Reggie Harris' defense attorney. That bomb takes down an apartment building. Mary's clinic is nearby and Kate gets in to help but has another panic attack and leaves. Mary follows and confronts Kate about being Batwoman.
Kate returns to the Batcave and suits up. Julia, Luke, and Sophie have discovered that Robles, a high-ranking Crow, is behind everything and she catches him and tracks down the third major bomb in the parkade of Wayne Tower. He admits to killing Lucius Fox and Luke comes down with a gun to face him.
Robles spills the story and Kate manages to talk Luke out of shooting him by sharing her experience with Cartwright.
In Arkham, Mouse kills his orderly and Dr. Butler with Elliot's shiv.
Sophie is reinstated and gets partnered with Julia for a major strike team.
Mouse approaches Alice wearing Dr. Butler's face and they decide to stay put.
On Batwoman Season 1 Episode 17, Batwoman encounters a new challenge when an old villain resurfaces, testing the heroics of Gotham's most stand-up citizens.