"Zarbi Doctor" is a title based upon conjecture.
Check the behind the scenes section, the revision history and discussion page for additional comments on this article's title.
According to one account, the version of the Doctor from the Daft Dimension regenerated into a Zarbi. They rejoiced over the fact that they now had more arms to operate the TARDIS control console.
They wore a stovepipe hat and a pair of yellow trousers. (COMIC: The Daft Dimension 587)