This episode is in many ways a wonderful parallel to Frankenstein (1931). The episode has:
The lightning giving life (a theme seen before in Doctor Who).
The atmospheric lab, with bubbling chemicals and flames and an albeit more modern take on electrical arcs (the screens).
The creator (in this case the Daleks) fall foul of their own creations.
The music - a lot of it is reminiscent of the era, and of the old Flash Gordon style serials.
The "townspeople" making a stand.
The assistant being deformed (pig slaves, as opposed to a hunchback).