Frank Spiggot
Frank Spiggot was a police officer in the Uva Beta Uva system. When he met the Fourth Doctor and Romana on the Rock of Judgement, he said he was looking into anomalies in the computer system. However, he was really looking into the murders of a mining team on Planet Eleven. The environmental engineer had been psychokinetically crushed to death, and the only person who killed in that manner was Xais. But since Xais had been executed on the Rock three years prior, Spiggot was trying to find out if she might be alive.
In a manner of speaking, she was. Xais had imprinted her brain patterns in a helicon death mask, using it to control people. She planned on mining a large amount of helicon, then imprinting it and using it to create an army of mental duplicates. Before she could carry out her plan, her host body was killed. Without a body, she could not control the helicon being primed. It expanded and covered the surface of Planet Eleven, trapping her mind there. The Doctor gave Spiggot a formula to render the helicon inert, eliminating any remnants of Xais' mind. (PROSE: The Romance of Crime)
