I remember watching an Iron Man cartoon on TV. I don't know the name of the original TV series because I watched it on a TV show called Fox Kids, which used to show different cartoons each day without disclosing its name. The TV show was probably a partnership between TV channels viz. Fox Kids (US) and Star Plus (India). Something more about the cartoon:
MODOK and the Mandarin were villains. The Mandarin had real magical powers of rings unlike in Iron Man 3 (in which he was a fake terrorist). War Machine was also in it. In the intro, Tony used to put on the helmet using an electromagnetic/invisible force, not like this (but, it can be intro of different season, not necessarily different TV series).
Now, about the episode I am looking for:
Pepper was kidnapped or lost.
Iron Man found her, but he went out of power.
The scene: It was a vertical tunnel. Underground.
Pepper had a Walkman with her.
Iron Man connected a wire coming out of his finger to the Walkman and told Pepper to play it on high volume.
And, it worked.
There can be a little bit of variation because the images in my memory aren't 100% clear. Can you please identify the episode?