Kamoa was the great statesman of the planet Freedonia who, with the assistance of he Third Doctor, led a successful revolution against the Freedonian oppressors. When the Doctor returned with Jo Grant, however, they discovered that Kamoa had gone power-mad. He was now oppressing the few remaining Freedonians. He hads converted himself into a sort of living brain, living in a specialised environment. He also created an army of robots and given each robot some of his organic brain cells. This bound all the robots into a sort of gestalt entity, with Kamoa at the heart.
The Doctor discovered the few remaining biological Freedonians. They reported they were now exploited by Kamoa and his robot army. Jo asked Bolgar, one of the robots, some questions that challenged his logic. He turned on Kamoa, killing him. The entire robot army immediately ceased to function. The Doctor and Jo departed, leaving the Freedonians to rebuild a free society on the planet. (COMIC: After the Revolution)