Thanks to the brilliant improvised line by Robert Downey Jr. in Iron Man, in which Tony Stark admits to being a superhero ...

The Mysterium suit acts as a symbol of Tony Stark's support for mutantkind in ... The Stark Sentinels weren't just the usual giant robots the X-Men face, but 30-foot-tall Iron Men.

Once back home, he then begins work on perfecting the Iron Man suit. But the man who was put in charge of Stark Industries has plans of his own to take over Tony's technology for other matters.