Nygma (Cory Michael Smith) guides Martin (Christopher Convery) to follow his instructions and kills the people sheltering him before taking him.
After realizing Martin has been taken, Sofia (Crystal Reed) orders Zsasz (Anthony Carrigan) to kill Cobblepot (Robin Lord Taylor), accompanied by Headhunter (Kyle Vincent Terry), who managed to survive his stabbing.
Bullock intercepts them in Arkham Asylum and police officers force them to leave but he discovers that Cobblepot escaped with the help of Nygma.
Fries arrives with Cobblepot frozen in a block of ice and gives it to Sofia, who orders Nygma to be killed in the docks.
Bullock manages to escape with Penn but Gordon is shot multiple times by Sofia, who chastises him for his attempts to stop her.
Barbara suffers severe headaches, sees her hand shining and finds Ra's al Ghul (Alexander Siddig) walking towards her.
In March 2018, it was announced that the fifteenth episode of the season would be titled "The Sinking Ship The Grand Applause" and was to be written by Seth Boston and directed by Nick Copus.
In March 2018, it was announced that the guest cast for the episode would include Anthony Carrigan as Victor Zsasz, Kyle Vincent Terry as Headhunter, Stu "Large" Riley as Sampson, Christopher Convery as Martin, and Nathan Darrow as Mr.