"If Sam Dann had any kind of sense of humor, I wonder if it didn't cross his mind to end this show where the character winds up getting off the train only to be greeted by a bunch of primates instead - ala Darwinism?

That would've been good for a laugh! "................................................. ...............................Interestingly enough the same thought occurred to me, though not as a source of humor, irony or bemusement. Finding primates, or at least primatives, would have enriched the story and allow it to evolved beyond the expected.