Deathstroke (Teen Titans)

Deathstroke appears as the main antagonist in the two first seasons of the Teen Titans animated series voiced by Ron Perlman.

History
As a nod to his comic counterpart, his mask only has one eye-hole, though his "true" face is never shown and his mask was only taken off half-way during his first battle with the Titans; but was silhouetted by a shadow (he was shown to have brightly colored slicked back hair), and then he was seen with his face as a skull with a scar running through his right eye socket when he accompanied Robin against a battle with Raven's father.

In the episode "Forces of Nature," however, he wears a disguise that closely resembles his face from the comics. He is also changed from a mercenary and assassin to an enigmatic criminal mastermind (though in one episode he states that he enjoys working for someone else), dispatching slews of supervillains and android ninjas to kill the Teen Titans instead of directly coming after them himself. Most of Slade's plans are strictly scientific in nature, though he did summon a fire elemental in one episode.

Slade is shown to be ambitious, calculating, and incredibly sadistic; however, his underestimating of the bonds that exist between all the Titans and his fury over not being able to sever those bonds have often led to his undoing. His main goal is apparently to kill the Titans and conquer the city, and quite possibly the world.

In the first two seasons he seeks out an apprentice, starting with Robin in the first season, who he coerces into working for him by threatening to kill the other Titans with nanobots, and then Terra, whose desire for control and acceptance he preys on. Slade is killed at the end of the second season by Terra, who drops him into a lava-filled pit, and is, as a result, mostly absent in the third season, with Brother Blood acting as the main villain.

In the Season 3 episode "Haunted," Slade appears as a figment of Robin's imagination, due to a chemical reagent released from his mask when Robin touched it, causing Robin to see hallucinations of Slade which attacked him. His mind made the injuries inflicted upon him real. Robin eventually figures out what is happening and overcomes the hallucination. However, it is revealed that this gas had been triggered from the outside by an unknown party. Slade returns in the fourth season as an undead servant of Raven's demonic father, Trigon. He is empowered with vast pyrokinetic abilities, superhuman strength and durability, flight, regeneration, phasing, electricity generation, teleportation, and other supernatural powers making him far stronger than the Teen Titans (except for Raven). Slade entered into the deal in exchange for being brought back to life, but was predictably betrayed. Intent on getting his due, he helps Robin find Raven, locating the source of power which restores his mortal form along the way.

He aids the Teen Titans in defeating Trigon afterward. He escapes capture after the world is saved as both he and Robin noted the partnership changed nothing. After the fight with Trigon, Slade himself makes no more appearances throughout the show, however a robot duplicate of him does appear in the last episode of the series "Things Change," when Beast Boy is searching for answers on why a girl who appears to be a newly revived Terra seems to have lost all memory of her past or superpowers. Slade confronts Beast Boy denying anything to do with Terra's sudden return and stating that if Terra does not remember her past, it is because she does not want to remember and that he should leave her in peace. Infuriated by his speech, Beast Boy attacks Slade, only to find out that it is just another robot duplicate.

In the Teen Titans: Know Your Foes interview on the Season 2 DVD, Slade is said to have enhanced strength and an enhanced healing factor. He appears also to have a degree of super speed, as he was able to move faster than Robin could see during their fight in "Apprentice Part II". He is well-trained in most forms of combat, both unarmed and with weapons, to the point that he appears to be Robin's better, besting him frequently and fairly easily during their fights but never delivering a finishing blow. It eventually took all five of the Teen Titans to defeat him, though they did so soundly.

He also fought Beast Boy once in person, and though the fight was inconclusive, he could have killed Beast Boy at least twice during it. He is a bona-fide genius, with great knowledge in robotics, as well as military, political, and subversive strategy. However, he was easy to anger, which Robin eventually took advantage of. He seems to possess some knowledge of ceremonial magic (as seen in the episode Forces of Nature). He appears to have access to extremely advanced technology and various secret hideouts, nearly unlimited resources, and a vast army of robot minions.

However, Slade's most notable quality is that he is a master of manipulation and psychology, allowing him to get his foes to do almost anything he wants through shrewd manipulation. He is also the only main Titan villian still at large at the end of the series.