Bette Noir is one of the D.N.Aliens, genetic abominations kept at Project Cadmus. Bette Noir tries to leave her grotesque physical form in search of psychic energies which would allow her the freedom she desired. She was drawn to J'onn J'onzz, as he is a powerful telepath. After their first encounter she attacked Dubbilex, and Martian Manhunter was called in to investigate. He stopped her and attempted to rehabilitate her.
Later, her physical form was killed by Dr Trap, and her psychic being was stored in his person as a trap for Martian Manhunter. Some time after this, she was roaming free from consciousness to consciousness and encountered Harley Quinn.
Major Story Arcs
Harley Quinn: Welcome to Metropolis
For more information see : Harley Quinn
When strange things start happening in Denver, where woman are acting crazy and under outside control, J'onn J'onzz, looks into it and believes that Bette Noir may have something to do with it. J'onn makes a trip to see Dr. Trapps and more importantly he goes to see Bette, whose psychic being is inside Trapps mind.
When J'onn goes into Trapps mind he learns that Bette has turned it into a nightmare. J'onn tries to fight Bette but knows he needs Trapps help to defeat her. J'onn taps into Trapps physique to change the enviroment to one more suited to Bette's mind set.
There J'onn learns that Bette has nothing to do with the current situation in Denver, but she gives him a hint that the Manhunter always gets him man, too bad they aren't all men.