|Place of origin:||Uva Beta Uva|
|First seen in:||The Romance of Crime|
|Other appearances:||AUDIO: The Romance of Crime|
|Main voice actor:||Miranda Raison|
Three years later, she had gained enough strength to influence Margo to put on the mask. Now mobile, she continued her quest to destroy all “Normals”. She planned on mining a large amount of helicon on Planet Eleven, then imprinting it and using it to create an army of mental duplicates.
When Margo's body was killed, Pyerpoint forced the mask onto Romana II. Eventually, the Time Lady was able to overcome Xais' influence and remove the mask. Still needing a host, she convinced Pyerpoint to put on the mask so she could give him the secret of her immortality. While struggling for control, he was killed by one of the station's robots, which Pyerpoint had ironically programmed earlier to kill any intruders. Deprived of a body, she could not stop the primed helicon from expanding and covering the surface of Planet Eleven. The Fourth Doctor gave Frank Spiggot a formula which would break down the helicon, destroying what remained of Xais forever. (PROSE: The Romance of Crime, AUDIO: The Romance of Crime)