For Walkabout, I've deliberately left the apocalypse a bit vague and undefined. What happened to tilt the earth? What happened during the nuclear winter when the cloud of volcanic ash filled the earth's sky? What madness descended on the remnants of humanity when their nightmares manifested?
I think I've found a good inspiration for this period in the game's history.
I haven't read through it all yet, but there are inspirations for proto-outlander mutants, spirits (manifesting as monsters and aliens), Geiger counters and folks descending into all degrees of madness. It could easily serve as backstory to a session.
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