The Tarkans are a race of shapeshifting aliens. The Tarkans have the uncanny ability to fog the minds of those around them, allowing them time to alter their appearance and make those around them seeing their new form as the true form. These two traits allowed the Tarkan to co-exist with nearly any other race as if they were members of it. They could appear to be almost any species, and cloud the minds of those around them to reduce suspicions. Unlike other polymorphic species, the Tarkan's natural endoskeleton limited their ability to shape-shift to humanoid forms only. Because of their unusual abilities, the Tarkan are thought of as disreputable spies and assassins. In general, however, they were a non-aggressive species which could live to be 500 years old or more.