Iron Man ending / spoiler
Obadiah (Jeff Bridges) takes Tony's (Robert Downey Jr.) second version of the artificial heart used to power the suit (and that's used to keep himself alive) and uses it to power another suit that was recently built at Stark Industries. Tony battles Obadiah in his suit using the first version of the artificial heart. Tony asks Pepper (Gwyneth Paltrow) to overload Stark Industries' arc reactor and Obadiah's suit malfunctions and falls into the reactor. The next day, at a press conference, instead of covering up the truth by saying that someone in an armored suit is his "bodyguard" (nicknamed by the press "Iron Man"), Tony reveals that he is Iron Man.
Submitted by Alex
