Scrooge McDuck

Scrooge McDuck was, according to the Ninth Doctor, a "peasant" compared to Drake Ayelbourne, the richest man in the universe. (COMIC: Mystery Date)

Behind the scenes

 * Scrooge McDuck is a fictional Disney character who first appeared in various comic books from 1947 before going on to appear in other media. He is the in-universe uncle of Donald Duck (from the same fictional universe as Mickey Mouse). The character is known for, among other things, his immense wealth.
 * David Tennant voiced Scrooge in . Prior to this, one of the most renowned authors of comics featured Scrooge, American cartoonist Keno Don Rosa and self-confessed fan of Doctor Who, had drawn a rendition of Scrooge (in a costume reminiscent of the Eleventh Doctor's) using the TARDIS to go back in time to 1896 in the Klondike, meeting his younger self just as he is about to become a millionaire, and another one where Scrooge (in his normal costume) appears intent on selling the TARDIS at a "Slightly Used Tardis Lot" . Both cartoons are considered canon on the Scrooge McDuck Wiki, though not (obviously) on Tardis Data Core.