The Things are a fictional race created by Chaosium in 1994 for the Call of Cthulhu RPG, whom are based on John W. Campbell's Who Goes There and were more directly based on the alien in the 1982 sci-fi horror movie, "The Thing" (which was based on the novel, Who Goes There).
The Things are a race from a distant world that orbits a blue star. A deceitful race with the ability to shape shift into the form of any creature that they consume. In the process they absorb the mannerism, skills, and memories of the victim, giving it the ability to perfectly imitate any organic life form. They can not only completely transform themselves but they can also transform specific body parts, quickly creating claws or teeth. Every cell in their bodies acts as an intelligent independent organism, and even their blood will move to escape that which harms it.
Things have the ability to bud and create independent organisms, splitting into two. Dismembered body parts become separate creatures and its blood will attempt to enter a victim, consuming it from the inside and creating a new organism. They are technologically advanced race that possesses intestellar ships, energy beam weapons, fusion power packs, anti-gravity packs, and possibly time travel technology.