The Mesopotamian goddess of chaos, TIAMAT is a being ruled by her whims. It was on a whim that she banished her brother, GOZER, to an eternity of exile... and it was also on a whim that she decided to meddle in the lives of the four mortals who managed to stop her returning brother from destroying the world -- the GHOSTBUSTERS.
Tiamat was ultimately banished from THIS plane of existence by WINSTON ZEDDEMORE, who was willing to sacrifice his life to do so. (Instead, Tiamat tortured him by removing his recent marriage to TIYAH CLARKE from everyone's memory but his own). Now that the Ghostbusters have the ability to travel to other dimensions, she's taken a renewed interest in them...