Owen (Total Drama): Oh no! The Memory Stone stole her memories! She can’t even remember Twilight’s name! Or Pinkie’s name, or Applejack’s name, or Rarity, or Fluttershy, or Rainbow Dash, or Canterlot High, or Sunset’s pet lizard back home, or any of them!

@sxcbeast  
Yeah, it’s because she lost the memories of her first time in the human world, the memories of the events from the first four films, the prequel shorts, the post movie shorts, the three Magic specials, the summertime shorts, Better Together season 1 episodes 1-12, CYOE season 1 episodes 1-10, and the events of this special from “We’ve come so far to the confrontation of Wallflower Blush. The only memories that she remembered were the memories of Equestria. Even the time she stole Twilight’s crown. After losing her human world memories, I think Sunset Shimmer would become evil again!  
SpongeBob: Evil?!  
Mr. Krabs, Squidward, Patrick, and Sandy: Evil?! (Mermaid Man zones out, so Mr. Krabs slaps him)  
Mermaid Man: EVIL!

Love that she went right back to balling up her fists like hooves after getting her memory erased.