Marvel Cinematic Universe: 10 Biggest Retcons Made By Marvel Studios

10. Peter Parker's Iron Man 2 Cameo

After The Amazing Spider-Man 2 proved to be a critical and commercial disappointment, Sony Pictures turned to Marvel Studios for help and that's why the web-slinger was rebooted in Captain America: Civil War. However, while that movie served as Peter Parker's introduction, actor Tom Holland dropped a bombshell shortly before the release of Spider-Man: Homecoming in 2017.

The British actor revealed that the little boy in Iron Man 2 dressed as the Armoured Avenger who squares up to one of the HAMMER Drones was, in fact, a young Peter.

Kevin Feige would later confirm that, and while this kid was obviously never originally meant to be Peter, the age works (and the fact the real Iron Man turns to him and says, "Nice work, kid!" would explain why the MCU's Spider-Man is something of a Tony Stark fanboy).

It also seems likely that Peter would have been at the Stark Expo alongside his Uncle Ben, someone who it seems could have been responsible for instilling a love of science in his young nephew.