An comedic, episodic homage/pastiche of film Noir with mild fantastic content:
Nazis have developed a cheese bomb technology with which to destroy the USA.
Each episode does not necessarily follow from the one before, but the basic thread is never lost, and it does a very competent job in integrating classic footage from representative Noir films (also see Zelig (1983).)
Steve Martin does a good enough (comic) deadpan to compete with Harrison Ford's (serious) narration in Bladerunner. Carl Reiner makes for a good, evil Nazi.
Incorporates the old 'Slowly I turned' vaudeville sketch.
Check it out.