|“||This isn't about Dent. Its about you. Ya got two choices. I press a button, Dent dies. Or kill me & save Dent. Either way, tonight is the end of the hero known as Batman.||„|
|~ Slade to Batman|
Deathstroke (Real Name: Slade Wilson) is the main antagonist of the second half of season one and takes on the identity of Dane Lisslow (anagram of the real name) in most of his appearances before appearing as Deathstroke himself.
Deathstroke is a mercenary and assassin who was recruited by Anarky and Harvey Dent to target Batman and was first seen under the alias of Dane Lisslow who is the captain of Harvey Dent's Special Crime Unit. However, his willingness to go to extremes to confront Batman, such as kidnapping and endangering his other client, Harvey Dent, causes them to sever ties. Deathstroke seemingly falls to his death near the end of the episode. However, at the end of "Epitaph", he is revealed to be alive.
In "Twist", it is also revealed that he is both Slade Wilson (a former CIA agent and protege of Alfred Pennyworth) and Dane Lisslow. After Alfred witnessed how ruthless Slade Wilson was, he had him terminated from the CIA. Losing his life and family, Wilson is driven to work as top class assassin and mercenary Deathstroke. Several years later, Alfred seeks Slade to mend their relationship, which only causes Deathstroke to be fired from his current employers and left for dead. He feels betrayed by Alfred and wants revenge on him and Batman/Bruce, engineering a complex scheme to study both Bruce and Batman as Lisslow, ruin his name and resources as an impostor Batman, and eventually lead to their painful deaths. Deathstroke confronts Batman and Katana, leaving them for dead.
In "Alone", Deathstroke steals the Batmobile and heads to the Batcave, holding Alfred hostage and vandalizing Wayne Manor. Deathstroke confronts Batman and Alfred in a final fight in the Batcave, willing to kill Alfred's "son" in front of him, and even rigging the cave with explosives if something else went wrong. In the climax of the battle, Deathstroke loses his right eye in an explosion during his fight with Batman. Despite his defeat, Deathstroke still threatens to expose Bruce's secret identity as Batman. However, with the assistance of Metamorpho and Man-Bat, his memory is wiped with a chemical compound rending Deathstroke amnesic.