The Amazing World Of Gumball - "The Rex" (partially found cancelled episode of animated series; 2012)
In 2012, prior to its premiere, a complete list of season-two episodes of The Amazing World of Gumball was leaked online. Included in this list, strangely, was an episode that ended up being unaired titled "The Rex". The reason it was scrapped was that it was seen as too expensive to make and not worth the effort.
Very little about this episode has been released on the Internet, except for a single storyboard that was once on Jean Texier's website (alongside storyboards for the rest of the episode), which shows Tina Rex and her father attacking the titular character, Gumball, and a shot of a ravaged city. While the episode has yet to be made, elements of the story may have been reworked into the season 4 episode "The Routine."