The second season of Gotham got very aggressive with the new villains they introduced. Where the first season focused on Penguin, Riddler, Fish Mooney and Carmine Falcone the visual effects that went along with those characters were pretty straight forward. But with season two where the touted Rise of the Villains led to the introduction of Firefly, Mr. Freeze, and Clayface, the visual effects levels rose as well.
CoSA VFX worked on the season and have put together this highlight reel of the effects for Gotham season two showing everything from Firefly's blowtorch to the CGI enchanced Arkham Asylum.