Lego Rock Raiders was a Lego theme introduced 1999, and discontinued in 2000. Rock Raiders was the only theme in the Lego Underground series before Power Miners. The theme, while short-lived, featured sixteen sets and was backed-up by numerous story-related media, including several comic books and video games, In 2013 development started on Rock Raiders 2 by the original developers of the game and is still in development today.