Tony Stark isn't the only superhero who has sported an iron suit of armor in the MCU – ten other Marvel characters have joined him.

The final episode of Ironheart gave the MCU's newest hero a huge upgrade that could prove helpful – and dangerous – in Avengers: Doomsday.

Doctor Doom is coming to the MCU, which means the heroes need to get their acts together and figure out how to repel the greatest threat of all time.