The shows executives where only asked to make 13 episodes. It was enough to have the show shown in syndication around the world, and even tho it was a hit show, no more episodes where ordered even after popular demand.
Despite popular belief, this show was not something that became a movie, instead it was a more popular cartoon version of the movie that was developed almost 2 years after the live action movie.
In 2014 a Warner Bros. plush pillow was released highly resembling the monster.