Ep 4. Helping Hand, Iron Fist

Whilst trying to contact old Friend, industrialist Tony Stark, Banner becomes the victim of an earth tremor and loses his memory. Rick Jones and Stark eventually realize he's missing and search for him with the aid of Stark's armored identity as Iron Man.

What they find is an amnesia stricken and paranoid Banner, who soon becomes too frustrated to repress The Hulk, who likewise doesn't recognize Rick or Stark, and he battles Iron Man to a standstil, to make matters more complicated, the military are aware Stark is freinds with Banner