The Crimson Dynamo Strikes Iron Man : Season 1 Episode 14

Professor Venko, electrical genius, is in fact the feared Crimson Dynamo. Tony Stark draws Venko to the side of freedom, but the beautiful and deadly Black Widow arrives with one goal: Iron Man's death! When the Crimson Dynamo battles Iron Man and defects, the Black Widow's partner dons the Dynamo armor. The original Dynamo sacrifices his life so that Iron Man can defeat his evil counterpart.