Eckersley

Eckersley, along with Vega Nexos, was a Galactic Federation mining engineer stationed on Peladon.

Biography
Eckersley was secretly working for Galaxy 5 to subvert trisilicate production, and used a heat ray disguised as the spirit of Aggedor to kill miners and frighten the rest into ceasing work. Then he convinced Ambassador Alpha Centauri to call for the Ice Warriors led by Azaxyr (who, unbeknownst to the ambassador, were also working for Galaxy 5) to take over. Eckersley would have gotten a cut of the profits from all the trisilicate sent to Galaxy 5, and planned to be ruler of Earth after Galaxy 5 defeated the Federation. Eckersley and Azaxyr's plans were exposed by the Third Doctor. He took Queen Thalira hostage and fled into the mines, where he encountered and was killed by the real Aggedor - but not before he fatally injured the creature. (DW: The Monster of Peladon)