Clark gets shunted into the 616 Marvel Universe by a cosmic force and is unable to return to the DCU.
What do you see as his new role on this Earth? Which characters become his greatest friends/allies and which villains become his greatest enemies?
Would Superman be a good fit for the Fantastic Four/Fantastic Five?
Some fights for Superman in the MU: (not a gauntlet)
Fin Fang Foom
Ultron (adamantium body)
About the same as Sentry, Gladiator, Hyperion, or Nefaria in powerset and levels. I expect he would befriend the Avengers- certainly Captain America anyway. I don't see him as a good fit for the FF being that they are primarily scientific explorers at their heart, and not a "save the victims" group. I would think Ultron, Doom, Nefaria and Mephisto would be Villains Supes would face... maybe Juggernaut or the dark Avengers too.