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It also marked Robert Downey Jr’s debut as one of the most iconic heroes that all know and love, Iron Man. Iron Man was the beginning of all things that lead to the formation of Avengers. The film ends as Stark comes forward and reveals that he, in fact, is the man behind the red suit of armor, known as Iron Man. Stark moves and encounters Stane and an intense battle takes place between the two before Stane is killed after his arc reactor explodes due to an electric surge. S.H.I.E.L.D agents come forward and try to arrest Stane but prove to be no match for him due to his plagiarized suit.

Stark perfects his suit but is only able to power it up to a limited extent after Stane steals his arc reactor.
