Slade a big enemy in Teen Titans. Some would say he was the main villain of the series. He is Robin’s main rival. In Season 4 Slade returned with vast power. He now had firepower and super human strength. Being both powerful and quick make him the most deadly enemy in Teen Titans. The Shredder was also a major villain in TMNT 2003. He appeared in nearly all Seasons and in there farewell movie. However once the turtles found out he was an Utron he started to become weaker. It got to a point where Leonardo beat him one on one and two comic relief villains beat him in the movie. Slade wins.