Whifferdill
Whifferdill were a shape-changing species from the planet Xenon. (COMIC: Voyager [+]Loading...["Voyager (comic story)"]) Their real form was a humanoid, pale yellow in colour with a round, featureless head.
Frobisher, the Whifferdill companion to the Sixth and Seventh Doctors, referred to his species as "the scourge of the Galaxy" and "public parasite number one". (COMIC: The Shape Shifter [+]Loading...["The Shape Shifter (comic story)"])
A Whifferdill's shape-changing abilities could be impaired if they were infected with mono-morphia. (COMIC: Genesis! [+]Loading...["Genesis! (comic story)"]) They were related to Kymbra Chimeras, another shape-shifting species. (COMIC: Changes [+]Loading...["Changes (comic story)"])