Chief Science Officer: Davros. Blind, one-armed and wheelchair-bound, but his skill with a test-tube single-handedly {heh} created the Daleks, who went on to ravage the whole of space and time and ultimately put paid to those pompous big-collared bastards from Gallifrey.
Evil fascist Brigadier -sorry, *Brigade Leader* Lethbridge-Stewart will head up the away team, because he is a mighty leader of men, and Grand Master Tomas de Torquemada {from Nemesis the Warlock] will be Chaplain/Morale Officer because he is a foaming bigot who wants to cleanse the universe of all alien life. Be Pure. Be Vigilant. Behave.