Superman and Thor: A Plausible Scenario For Their First Encounter?: (An Exercise in Speculative Fantasy)
Good Day Stephane86
Here's what I got so far. First of all, I think Brainiac should play a major role. Suppose the Kryptonians and Asgardian are related. In fact, suppose that the Asgardians are what the Kryptonians would have evolved into in a few hundred years, certainly less than a thousand.
They were so close before Krypton was destroyed. This is why the Earth's yellow sun gives Kryptonians such fantastic powers almost instantaneously. What happens is that the Earth's sun and gravity activates the evolutionary mechanism inside Kryptonians, literally changing them in very profound ways - making them "gods."
Therefore there must be a profound connection between the planets Earth, Krypton, and Asgard. This leads us to think about why Krypton was REALLY destroyed, but I'll come back to that.
The Asgardians know they are not gods. But they are not, by any means, of one mind about what to do about that. Some of them continue to indulge themselves on distant, primitive planets whose inhabitants worship them as gods. Some of them indulge themselves in Earth's ancient past, where they continue to be lavishly attended to by the ancient Vikings and so forth.
They are not gods, but they are highly advanced cosmic beings. They can move back and forth through time like you and I can go to the beach. Odin allows this, on a limited basis; but they must be careful not to change history.
Time to bring in a "Greek" god. In Greek mythology, Prometheus was the Olympian god who gave man fire. But in your story, suppose that Prometheus isn't an Olympian at all. Suppose Prometheus is really.......Loki!
This is what I'm thinking. Loki gets his butt kicked yet again by Thor - who smote him a mighty blow with Mjonir, his mystic hammer. Loki falls through the heavens onto the fourth-rate planet, no one is taking notice of at this time in the distant past.
Loki licks his wounds and takes refuge in a cave, somewhere in a land, that would thousands of years later, come to be known as "Greece." Loki ponders. If he's ever going to take over Asgard today, tomorrow the universe! he's going to need reinforcements. He's going to need to reinforce his divisions with beings as powerful as his hated half brother, Thor and Odin. He would cultivate them himself.
Loki uses various spells and incantations to conceal his appearance on this world and disguise his appearance. He works in that cave around the clock, developing new technologies, including Brainiac. Brainiac is one and multiple. Brainiac Prime is the main "hub" of the system. There are hundreds, maybe thousands of Brainiacs scattered throughout the universe, performing the same role as Prime did on Krypton.
They were to watch over these planets and their peoples. They were to be helpful in every way. They were even to prevent these peoples from destroying themselves through war, that is, until they were ready, until they had reached the critical point in their evolution.
At this point, the Brainiacs would destroy the planets allowing a handful of the inhabitants to survive. Loki intends to round up those among the survivors evil enough to fight under his banner.
Side note: When Loki and his minions were working in the cave in Greece, a proto-human came along one day, and spied on them. One of the marvels he saw was the crackling fire. He leaves, sneaks back with a branch and grabs some of it. It is this proto-human who gave man fire, not Loki/Prometheus.
You know, Stephane86, at first I thought it was a problem that Thor is Marvel and Superman is D.C. But now I think its even better that way. That way you could plausibly claim that they have never heard of each other. Their first encounter should be a fight, as each one thinks the other is one of Loki's genetically engineered superpowered minions.
How's that? I hope that helped.
Take it easy.