Treena Grace was the inhabitant of an unnamed planet.
Cauchemar, under his Derran Sherat identity, married Treena as he believed she was the reincarnation of his lost love Jasmine. When she found out he was conducting experiments on their own baby, she tried to kill him. This behaviour made him no longer believe Treena was Jasmine, so he killed her. (PROSE: Vanishing Point)