10 Marvel Cinematic Universe Surprises The Trailers Ruined

10. Iron Man - The Original Armour's Cameo

Iron Man's debut trailer was suitably explosive, arriving on the scene all guns blazing to herald the dawning of a new age of superhero movies.

It did almost everything right, showing off the film's incendiary action scenes, dazzling special effects, emotional core and Robert Downey Jr's razor-sharp wit, but in hindsight, it was a little too revealing.

The teaser footage highlights the entire evolution of the first-generation Iron Man armour, charting its origins from clunky prototype to iconic red and gold.

The original suit Tony Stark creates while in the custody of the Ten Rings organisation is a homage to the one he wore during his first comic book appearance in Tales of Suspense #39, and its presence in the film should have been kept under wraps.

Seeing Stark burst from his prison cell with the original Iron Man armour fully assembled would have been a great Easter egg for the Marvel Comic diehards. Who would have suspected that a Marvel relic dating back to 1963 would be included in the film if the trailers hasn't given the game away?