Gomb was one of the Soul Pirates onboard the Soul Pirate frigate. When new specimens for transplanting arrived from a planet, he used a Water hose to wash them down and then dragged them out of the cage for experimentation.
While scanning, Gomb found that there were Time Lords amongst the Humans they had captured. When he went to find the Time Lords, the First Doctor turned on his hose and he was thrown by the pressure out of the cage. When the ship later exploded, he was assumedly killed along with the rest of the pirates. (A Big Hand for the Doctor)