They are unknown robotic soldiers that work for an unknown organization. They first appear in The Art of Ninjutsu, where they are seen guarding the McGuffin. The Teen Titans fight them using ninja skills and are eventually destroyed.
They reappear again in The Titans Show, although they aren't seen with the audience (which are the titans greatest enemies) they are later seen fighting the Alien Skull Collector, but are eventually destroyed.
- It is unknown who they work for or who their leader is.
- In The Art of Ninjutsu, there appears to be hundreds of them, but in The Titans Show, only seven appear.