This might be premature since the FF are at least a few year off from their MCU debut, but I thought it'd be nice to posit a scenario. Let's imagine that Doom is off limits as the first movie villain. Who would you want it to be? Galactus is someone you'd have to build up to. So, let's postulate. Personally, I would want to see the Puppet Master and/or Mole Man (as he was the villain of the first ever FF issue). What are your thoughts?