Debra inhabiting Hemmer
Debra was the name given to an alien consciousness that resided in the Jonisian Nebula in the 23rd century, theorized to be a Boltzmann brain.
In 2259, as the USS Enterprise concluded a routine survey mission of the Jonisian Nebula, the entity (that would later be called Debra) brought a version of the fairy tale The Kingdom of Elysian to life from the mind of Doctor Joseph M'Benga's daughter Rukiya. Rukiya was later offered the opportunity to stay with the entity, and named her "Debra" after her own mother. (SNW: "The Elysian Kingdom")
The individual Vezda that replaced Ensign Gamble would later attempt to intimidate Doctor M'Benga by falsely suggesting that Debra also replaced his daughter. (SNW: "Through the Lens of Time")