Spongebob Squarepants is a licensed theme introduced in 2006. It was not the most well-received theme due to the fact that not everyone is a fan of the popular long-running television show that the sets are based off of.
After the 2 sets that were released in 2009, it was thought that the theme was discontinued. Very recently, however, 2 more sets (Heroic Heroes of the Deep & Glove World) have been released. It is unknown what will happen in the coming months and years.