Slist Fayflut Marteveerthon Slitheen
From Tardis Wiki, the free Doctor Who reference
Slist Fayflut Marteveerthon Slitheen was a Raxacoricofallapatorian.
While on Gharusa Prime, Slist pretended to be the Doctor and captured Rose Tyler when Rose found out that she was an imposter. (COMIC: Doctormania)