 Although several androids, robots, and artificial intelligences were seen in the original Star Trek series (What Are Little Girls Made Of? and I, Mudd), Data was often referred to as being unique in the galaxy as being the only sentient androidknown to exist in the episode, " The Most Toys  " (save the other androids created by Soong).
<meaning-changed>  Although several androids, robots, and artificial intelligences were seen in the original Star Trek series (What Are Little Girls Made Of? and I, Mudd), Data was often referred to as being unique in the galaxy as being the only sentient androidknown to exist in the episode, " The Most Toys  " (save the other androids created by Soong).
 Although several androids, robots, and artificial intelligences were seen in the original Star Trek series (What Are Little Girls Made Of? and I, Mudd), Data was often referred to as being unique in the galaxy as being the only sentient androidknown to exist in the episode, " Inheritance", Soong's former wife Juliana reunites with Data, though the crew discovers she was an android duplicate built by Soong after the real Julianna's death, programmed to die after a long life, and to believe she is the true Julianna unaware of the fact she is an android. Faced with the decision, Data chooses not to disclose this to her and allows her to continue on with her normal life. " (save the other androids created by Soong).