Slade

Slade Joseph Wilson (alias Deathstroke the Terminator), or commonly referred to as Slade, is the archenemy of the Teen Titans.

History
Slade, best known as the world's greatest enemy, is the Teen Titan's greatest enemy, particularly Robin's, who will stop at nothing to destroy them. Although he was the primary villain in the original Teen Titans series, Slade did not make any actual appearances in Teen Titans Go! until "The Titans Show".

Slade makes a brief appearance in the comic Silicon Valley Cyborg. When Robin asks Cyborg if he can be the VP of security, Cyborg tells him that he has already given the job to Slade. And with that, Slade sneaks up behind Robin and smacks him on the head.

Throughout the show there are small, brief hints of Slade, such as on Robin's punching bag in "The Date". Slade has also affiliated with some other characters in the Teen Titans Go series. Like, Terra (possible apprentice/servant) and Rose Wilson (daughter).

Season 1

 * Terra-ized (possibly on the phone with Terra)

Season 2

 * Cool School (referenced by his daughter)
 * The Return of Slade (mentioned, cameo)

Season 3

 * I'm the Sauce (stick figure)
 * The Fourth Wall (cameo in flashback, archive footage)
 * The True Meaning of Christmas (mentioned)
 * The Titans Show (in person debut, cameo)

Other Media
Teen Titans (2003)

Comics

 * Party Party (cameo on cover)
 * Silicon Valley Cyborg (comic debut, cameo)
 * May I Have This Trance? (cameo on cover)

Terra
Slade sent Terra to infiltrate and destroy the Teen Titans. Terra posed as Beast Boy's girlfriend in order to get the Titans most sensitive files. Terra ends up battling Raven. Terra ends left in another dimension alone for months.

Ravager
Slade's daughter, Rose Wilson, is a well known thief. She seems to not be impressed with her father's high level of crime. Even though he bought her two sword that she uses often.

Trivia

 * At the TTG Comiccon panel 2013, TTG's creators stated that they wanted to use Slade and Blackfire for the series, but they were unsure if they would be able to. However, Blackfire has appeared in the Season 2 Episode "Mr. Butt", and Slade was mentioned in the episode "The Return of Slade".
 * The writers of the show have stated that they CAN use Slade, and they WANT to use Slade for the series, but are not sure HOW to use him (a dark, serious villain) in the show's silly format.
 * He was voiced by Ron Perlman in the original series.
 * Ron Perlman reprised his role in the 2013 direct-to-video release Justice League: The Flashpoint Paradox.
 * He was one of the primary antagonists of the original series and was one of only two villains to appear in all five seasons (the other being Gizmo). Slade and Red X are the only villains to not be captured at the end of the series.
 * In this series, The H.I.V.E. Five replaced Slade as the main antagonists.
 * He is also one of only two villains in the original show to switch sides (the other being Jinx). However, once his "revenge" was complete, he continued to be an enemy of the Teen Titans.
 * Slade's role in the first animated series is somewhat different from depictions in the comics, in the sense that he is a pure evil criminal mastermind, rather than a prominent mercenary who only leans evil and sometimes even fought for the Titans. However, he was willing to work for others if it benefitted him (as he did with Trigon, before the demon betrayed him).
 * The arrow in the Slade doll could be a reference to the CW's hit TV show "Arrow", in which Slade is the main antagonist of Season 2.
 * He shares similarities with the Marvel character, "Deadpool". In fact, Deadpool was created so much like Deathstroke, the creators decided to acknowledge that fact and made him even more like Deathstroke.
 * He did not appear in the digital download of Silicon Valley Cyborg for an unknown reason.
 * He was teased to appear in "The Return of Slade", but was only mentioned and his head and mask were shown.
 * A Teen Titans GO! version of Slade appeared on an alternate cover of Deathstroke issue number 8.
 * Slade made an official appearance in "The Titans Show".
 * He is the twenty-seventh villain from the original series to debut in Teen Titans Go!
 * He is the last one of the Titans' arch-enemies to make a debut in the series.