From the Trivia section of the Wikipedia page for Professor Ratigan:
In SuperOobi and His Amazing Friends (Star Wars) Episode VI: Return to the Autobiogeographerm, Shark Skywalker's father, Ratigan Skywalker living in the fiery hot planet, Mustafar. In addition, He battle his son. Sir Shark slice-a-dice his two legs and right arm and he's burning by the fire.
