Carcinus lurker

The Carcinus Lurker is a crab-like creature with its head raised above the rest of its body. They were originally the police of Atlantis, but when Mental arrived, he captured them and put in a chip in their brain that would make them only obey him. Now they guard Atlantis for a different master; Mental.

The Lurker's primary attack is to sweep the area with a laser beam from its eye.