The multi-form species is a sentient lifeform naturally gelatinous, appearing as a snakelike mass of glowing tendrils with a mouth full of sharp teeth. Capable of creating a perception filter to stop itself being seen, or to hide anything it wants to hide, it is highly polymorph. Having created a psychic link to a living but dormant creature, it can then copy the appearance of that creature or of anything they dream about. Coma patients provide the perfect live feed. They can live for millenia.
One specimen of the species, Prisonner Zero, a known galactic criminal, was locked up in an interdimensionnal prison on Earth by the Atrax for years until 2010.