Robot vs Viltrumites
Robot actually has a lot in common with the Viltrumites, in terms of outcomes for Earth. The aliens send a sleeper to study Earth for a later hostile take over by force and absorb them into their empire, while Robot covertly acts from within to build a utopia, and enforce it with an iron fist.
So what happens if a post Robot Earth encounters an expansionist Viltrum empire acting with the full might of their armada?
Assume no knowledge of each other.
Who wins?