Sour Note

Sour Note is the superhero alter-ego of Squidward Tentacles.

Never-ending story
When the radioactive Krabby Patty tried to kill everyone, Squidward Tentacles turned into Sour Note.

Along with Invincibubble, Mr. Superawesomeness, The Rodent, Sir Pinch-a-lot, Plank-Ton and the Mystery Crew, he kicked butt.

Later, clones of Mabel Pines rained on the SpongeBob characters. Sour Note screamed that it was raining happiness.