"An unnamed, unseen Neutropian is the daughter of Zulia and sister of Sparky. She was never seen or heard on screen. The only reference to her existance was in the episode \"The X-Rays\": Zulia left Sparky a voice mail reminding him to take his sister to her ballet recital, among other things."@en . "Sparky's sister"@en . . "An unnamed, unseen Neutropian is the daughter of Zulia and sister of Sparky. She was never seen or heard on screen. The only reference to her existance was in the episode \"The X-Rays\": Zulia left Sparky a voice mail reminding him to take his sister to her ballet recital, among other things."@en . . . . . .