Eckersley

Eckersley, along with Vega Nexos, was a Galactic Federation mining engineer stationed on Peladon. He was secretly working for Galaxy 5 to disrupt trisilicate production, and used a heat ray disguised as the spirit of Aggedor to kill miners and frighten the rest into ceasing work. He worked with the Ice Warriors led by Azaxyr (who were also working for Galaxy 5) when they took over, but their plans were exposed by the Doctor. Eckersley 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)