Alexander J. Luthor II

Alexander J. Luthor II, better known as Lex Luthor, is an antagonist in season 3 and season 4 of Gotham. He is the former CEO of Lexcorp, and a former mercenary for Jerome Valeska.

Eye of the tiger
He appears to be hired with Jerome Valeska, willing to help him kill and terrorize the people of Gotham City, only to revive them as lost souls. After bombing some houses, he claims responsibility in court, promising to fix it. A UFO is later seen bombing the Arkham Asylum, as he enters the ruins of the asylum, and finds some dead bodies, sending them to the Lexcorp Tower.

Lost in hell
He, Jerome and their henchmen have at first bombed Gotham's City Hall.

Lex Luthor then secretly works with Jerome in The Lexcorp X-Factory, intending to revive The Lost Souls by possessing criminal masterminds.

He stated that he needs more crystal operations to get them all powerful. Jerome then smiled and laughed heavily.

He later enters a museum owned by Max Shreck and bombs it together with Jerome.

The Next Flight
Lex Luthor claimed in court that the real criminal is James Gordon, who is all the time trying to close Lexcorp for no good reason. The judge told both James Gordon and Lex Luthor to get to an answer because that dogfight cannot continue. Lex later revealed his spaceship, named the X-Flight, to his men, inside his giant lab room. One of his scientists stated that it can destroy a whole city in a few strikes.

The Joker's Gambit
He and Edward Nygma sat together in the office of the Lexcorp building, and thought of how to take over Gotham. Lex Luthor revealed his plan for The XBomb, however, Edward looked carefully and stated that it isn't enough work to destroy Gotham City. Edward then showed him a jar with fatonium, and a plan for the helmet of fate. He then told him to build it, and revealed it is powerful enough to control the fate of a man by 50% chance, and it's able to clone people's futures with two possible paths.

Lex then laughed, and said the following line: "Well boss, what's our next move?"

Lex Luthor then attacked Gotham City with his spaceship, and destroyed some tall buildings. That helped Johnny J. Otrix to take over the city. He later helped Leopald Otrix, inside Owlburrow (the lair of The Court of Owls), to build The XBomb. He questioned Leopald about returns, however, Leopald pointed a gun at him, and stated that he only has the right to live. Edward Nygma however came from behind, and stabbed Leopald with a sword, causing him to faint. When Lex and Nygma ran away with the unready bomb, Leopald woke up, and got angry, thus pulling the sword out of his chest, and throwing it madly on the floor.