Three v Raxacoricofallapatorians

Doctors Two and Three are the only ones I could see making the Raxacoricofallapatorians actually work as frightening monsters. Troughton would take them as deadly serious threats, despite their look — much like he did the Yeti. While Pertwee would take them as an honorable, yet flawed race — especially the Family Slitheen.

Credit to @TimTarget for the picture.