Kragoom, sometimes known the Destroyer of Worlds, the World Mater, the Celestial Copulator, the Galactic Gigolo, the Universal Lothario, was one of the Great Old Ones, who destroyed planets by "shagging them to death". Just one of his eyes was the size of Wales, and his entire body was around the size of Jupiter.
When he found he a planet that he would want to mate with, he would use mind control on the inhabitants, causing them to chant for his arrival. The Clockworks were naturally immune to his power, and a Localised Psionic Dampening Field could also disrupt his powers on a small scale. (AUDIO: The Iris Wildthyme Appreciation Society)
Kragoom once set his eyes on Trull, and he headed their to do his business. At the time, Wayne Bland II had tricked Iris Wildthyme into swapping their minds, so while Iris had to get her body back, Kragoom was able to begin having foreplay with Trull. Iris got back into her body, and she prepared to sacrifice herself for Trull by swapping her and Kragoom's minds, but Wayne, realising the errors of his ways, sacrificed himself, and his mind was planted into Kragoom's body, and Kragoom's mind was trapped inside Wayne's body, which was imprisoned in the Trull Central Institute for the Criminally Insane.