Is Robert Downey Jr.'s Doctor Doom in Fantastic Four? It's a fair question, since Victor von Doom is usually heavily associated with Marvel's First Family.
Plus, with Avengers: Doomsday coming next year, it would make a lot of sense for the MCU to start setting up its next big bad in the first project of Marvel Phase 6. So, if you're wondering if RDJ's Doom does show up in The Fantastic Four: First Steps, we have all you need to know right here.
