Lady Irna was an aristocrat from a space faring species.
War Lord Mackal of the Yl-caan married her so his people could have access to their technology. When she was poisoned, she was sent to a planet with healing air. Unfortunately, after arriving she was transformed into a beast. When Commander Hon was sent to check on her, he believed the beast had killed Irna. The Sixth Doctor managed to convince him of the beast's true nature and stopped him from destroying the planet. (COMIC: Nature of the Beast!)