American billionaire Tony Stark is highly speculated to be back wearing his famous exoskeleton armor in "Iron Man 4." Though nothing is official, fans are anticipating that the rumored movie will be featuring not one, but two villains.

Stark, played by Robert Downey Jr., mentioned that he "could do one more" "Iron Man" movie during an interview with ABC News. This could be a hint that a plan will be laid by Marvel soon, since Downey Jr. is interested enough, or that production is already in motion, and the actor just dropped a bomb.

Fans are speculating on who the villains will be in "Iron Man 4"  if it pushes through. It is believed that Fin Fang Foom will be the main antagonist, which is said to be the power source of Mandarin. Mandarin is the antihero from the previous "Iron Man" movie.  This idea will give a continuity to the story.  Fin Fang Foom is an extraterrestrial creature that is similar to a dragon and is a longtime enemy of "Iron Man," Crossmap reported.

Another rumored antagonist is none other than "Spider-Man." It is highly circulating in the community that the teenager superhero will oppose "Iron Man." This might be in relation to another rumor that Downey Jr. will also be in the upcoming "Spider-Man" movie, which will star Tom Holland.  Downey Jr.'s character will act as Spidey's mentor.

Uproxx mentioned that Downey Jr. is said to be courting Mel Gibson to direct the rumored film. Shane Black, the director for "Iron Man 3," said, "I think he wants Mel Gibson to direct it. And for good reason. Mel was great to him. Mel's been really nice to a lot of people, including me."

If rumors prove to be true, the "Iron Man 4" movie will still be years away.  Currently, the company is still busy with several titles, including "Spider-Man: Homecoming" and "Avengers: Infinity War," in which Tony Stark will also be included. It is also rumored that a "Civil War" sequel might happen, where "Iron Man" faces "Captain Marvel."