Iron Man: Armored Adventures episodes 23 -Uncontrollable
When Tony responds to the Hulk’s rampage in the Dynamo Buster armor, the Controller takes control of him to attack AIM. The Controller had been manipulating Rick Jones, friend of the Hulk, to the same end. The Hulk agrees to help save Iron Man, and finds him at AIM headquarters struggling against the Controller’s attempts to force him to kill the wounded MODOC, whose mental attacks are powerless against a mind under the Controller’s power. Hulk liberates Iron Man by destroying the controller disc. MODOC escapes, the Controller passes out, and Rick and the Hulk move on.
NOTE: In this episode at no point does the Hulk ever turn back into Bruce Banner, even when he is calm.