An invasion of alien robots turns out to be taking place entirely inside human body.
The stars of the show are absolutely the tiny robots- the alien ways the move about and all the cogs that make them move. The environment is also rended in striking way- usually just various painterly shades of one colour.
Was also surprised that Schabenbeck's animation endeavors only lasted around 5 years- Inwazja being his last work. Afterwards he emigrated and seems to have focused on teaching.