Space Gods from Mars

"Ancient astronauts" did exist and they were Martians.
The series Quatermass and the Pit and its movie counterpart can serve as a reasonable benchmark for a modern campaign that blends Atomic Horror and a more modern version of Mars then most versions from the Atompunk Era.
There is the option of having Bronze age people leading a revolt against the Martians.
==References==
*Classic: Mars pg 42
Category:Crossovers
Category:Divergent History Suggestions