Robert Downey Jr. has donned many armored suits as Iron Man. Most of them made it onto the big screen. Others were not so lucky, either gathering dust or appearing in deleted scenes and behind-the-scenes photographs.Some new BTS photos from Iron Man 2 showcase the unused tech undersuit. From the photos, it looks like what Tony would wear under his suit before he started using nanotechnology in Avengers: Infinity War.RELATED: Iron Man 2 Propmaker Reveals Tony Stark's Unused Undersuit Armor

A previous photograph showed a stunt double wearing the undersuit. While it never appeared in the actual film, Tony can be seen wearing it in a deleted scene.

Iron Man 2 was the third MCU film and released in 2010. It introduced Natasha Romanov/Black Widow to the Marvel Cinematic Universe and teased the introduction of Thor in the post credits scene. It also gave Samuel L. Jackson's Nick Fury a more significant role.

Directed by Jon Favreau, Iron Man 2 stars Robert Downey Jr. as Tony Stark, Gwyneth Paltrow as Pepper Potts, Scarlett Johansson as Natasha Romanov, Don Cheadle as James Rhodes, Samuel L. Jackson as Nick Fury and Mickey Rourke as Whiplash. It is now available on Blu-ray, digital and Disney+.

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