Marvel fans, it's about time you buckle up and prepare yourself for one wild ride because the MCU theory mill is churning out some seriously intriguing theories about Avengers 5 . As icing on the cake, it looks like we might finally get some answers to the big Doctor Doom mystery. Picture this: Robert Downey Jr as Doctor Doom, a storyline ripped straight from Marvel Comics’ Secret Wars , and a possible clash with none other than Tom Hiddleston’s Loki.

Yes, you read that right. The former Iron Man going toe-to-toe with the God of Mischief himself in a twist that could redefine the MCU as we know it. A post shared by Robert Downey Jr.

(@robertdowneyjr) So, hold your imaginary horses, because this theory will blow your mind! Let’s begin by first talking about the masterminds behind the upcoming Avengers movies—Joe and Anthony Russo. These guys know how to deliver epic crossover events ( Infinity War and Endgame ). Much to our delight, they’re now returning to direct Avengers: Doomsday and Avengers: Secret Wars .

A post shared by The Russo Brothers (@therussobrothers) With the Phase 5 crossover movies on the horizon, it’s safe to say we’re in for one wild ride. The real kicker? Robert Downey Jr. is set to return, but this time, he’s ditching the iron suit and stepping into the fearsome armour of Doctor Doom.

And if that doesn’t blow your mind, I don’t know what will. Also Read: RDJ returns as Doctor Doom in 'Avengers: Doomsday' — How it impacts Iron Man's le.