Jerome starts a plan to gather people in Gotham, where he and the villains will release their deadly laughing gas toxin.
In the aftermath of the bombing, the Tetch virus is destroying Gotham. Jim and Bullock rush to find the antidote.
Jim is forced to use Barbara to help him. Bruce and Alfred track down information on a place called Pinewood Farms.
Penguin winds up in Arkham with Hugo Strange. Bullock and Gordon search for an icy killer.