Though many fans have speculated as such, no, Slade has no relation to Robin in the animated series Teen Titans.
Yes, he is. But in the show it's a bit confusing, he could be future Robin, coming back to secretly change little Robin, but that's just my hypothesis. If you want to save the show, go here: http://fightforteentitans.webs.com/
The end part 1
The Titans consist of Robin, Cyborg, Raven, Beast-Boy, and Starfire. The main villain was Slade.
no no no no no! Slade saw Terra and took her in so he could train her and have her defeat the teen titans.
Well, because slade sent out this team from the "hive" to destroy the titans. he assumes of course that slade is evil. and he is. Your probably right and I'm a softy who has never read teen titans comic version but in my head I think that slade is tony zuko (the man who killed robins parents) and robin sees something familiar you killed my parents. But your probably right.
Slade
Scott Menville Plays Robin In Teen Titans go
In Teen Titans, Slade is the villain who has the ultimate goal to annihilate the Teen Titans. He wears a mask and recruits Robin and Terra as apprentices, both of whom have betrayed him He recruits Robin by putting the other Titans' lives in danger, and recruits Terra by teaching her how to control her powers.
Ever since Slade disappeared, Robin has been questioning whether or not Slade is really gone. However, when Cinderblock breaks out of jail, Robin begins seeing Slade again. However, the problem is that he is the only one who can, and the other four Titans worry for Robin'ssanity when Robin is gravely injured during a battle by whom he claims was Slade. Raven telepathically enters Robin's mind in order to help him understand that Slade is truly gone, until she is able to see him too through Robin's own eyes.
Slade from the show TV show, Teen Titans, has the same face as Robin. However in a later episode, after he is pushed into lava, his masks falls off and Robin sees it was severely burnt beyond recognition.
Robin
Teen Titans Trouble in Tokyo