He is voiced by Derek Griffiths.
Corvax is the vizier of the king of Gondoland. He is a slimy, sinister green goblin who who is deeply in love with Princess Sylvia. Corvax also has a computer lab which he uses to carry out his wicked deeds. When he finds out about Bob and Sylvia's secret relationship, he becomes jealous and reveals to the king and queen that the two have been seeing each other. Bob, as a result, is arrested and taken to prison. Corvax tries to take Sylvia as his own but she rejects him. Disheartened, he decides to instead create a clone of Sylvia, but she rejects him as well. He smashes his computer in a fit of rage, which makes more clones of the princess, all of whom want nothing to do with him. Afterwards, Corvax fixes his computer but, he also ends up making more clones of Sylvia. He says he can't stop the computer. The king recklessly tries to stop the computer from making clones but causes a malfunction which traps him inside of it instead. Bob, who has escaped with Muzzy, helps the royal family free the king from the computer. Corvax manages to escape in his helicopter, but Bob arrives and knocks him out cold. The latter is taken away to prison, the clones go back into the computer and Bob and Sylvia are married.
In Muzzy Comes Back, Corvax has been reduced to a lowly cook for the castle. He persuades a thief named Thimbo to help him kidnap Bob and Sylvia's daughter, Amanda, who he plans to marry in order to insert himself back into royalty. In the end, however, he is outwitted and arrested once again.