Star Trek: The Next Generation
Episode: TNG 254 - Liaisons

Iyaaran who was capable of assuming various forms. He initially appeared to Captain Jean-Luc Picard as the pilot of a ship assigned to convey him to the Iyaaran homeoworld, but when the ship crashed he transformed into a human woman named Anna. Voval's true intentions, as an Iyaaran ambassador, were to learn about the concept of love.