#17: The Marvelous Misadventures of Flapjack
The Marvelous Misadventures of Flapjack is an American animated TV show that aired on Cartoon Network from 2008 to 2010. It follows the adventures (or misadventures) of a young man, a pirate, and a whale out at sea as they search for Candied Island.
It might be marketed as a cartoon for kids, but people who watched the show know how dark it really was. Some scenes were mildly scary, and others were downright terrifying and gory.