Samurai Jack

Samurai Jack is an American cartoon that follows a samurai named Jack on his search for a way to return to the past so he can forever defeat the shape-shifting wizard of Pure, Ultimate Evil, Aku, and undo his evil law that reached into the far future. Created by Genndy Tartakovsky, the show would go on to be aired on Cartoon Network from 2001 to 2004. During those three years, four seasons (each with 13 episodes, making that 52 in total) would be shown until Samurai Jack would go quiet for over 12 years. In 2017 (12 years later), it was revived with Adult Swim's Toonami and concluded with a fifth season, one that was much more mature than the other four seasons with bloody violence, language, and other less child-friendly themes.

Misc.
Time Travel - Aku sends Jack into the far future right before he gets finished off by Jack's magic sword.

UnTrashes
The Ultimate Evil [Reinforced] - Aku. This is what he's actually known as in the show instead of just acting like the Ultimate Evil. He's taken over the entire planet, worsened the lives of all non-evil beings, and seems to be able to stop Jack from traveling back to the past whenever he's Mere Moments or Inches Away from escaping the horrible future Aku has created.