Speaking of old TV series...how about a few 'Hogan's Heroes' inspired pieces?
Maybe a gangly, balding, monocled Commandant? An overweight camp guard? Certainly some generic POW/downed pilot type figures would be nice (ie. gents in leather bomber jackets). Possibly they could work in with the Resistance figures too...trying to sneak them back through the front to the Allied side and all that.
Although speaking for myself I'd love more Middle Eastern figures. The three suited gun toting ME chaps Artizan already sell are superb. Disha-dasha wearing archeological diggers? But I know Brigade already have a bunch of them...
Ok I'll stop because now I'm just rambling...
Definitely looking forward to the metal face plated Mad Scientist though!