PARASITES LOST is the one most apparently based upon a B&W episode, BACTERIA CORPS (I think that was the E version's name). While FANTASTIC VOYAGE may be better known, it did not have an entire civilization of microscopic creatures in it, as did the AB episode (& two earlier manga stories, 38TH PARALLEL & TUBERCULOSIS), which obviously inspired the B&W ep.
I have been making note of FUTURAMA eps that have such content, but forgot where I put them.
