An episode will air sunday showing Hulk catching up to speed demon and running at hyper speed. You can check out the preview on the marvel.com website. He seems to be charging up energy to run that fast. It might be something else though it is only a clip and it doesn't reveal why Hulk is running that fast but it does seem like he can charge up his gamma energy.
This edit will also create new pages on Comic Vine for:Beware, you are proposing to add brand new pages to the wiki along with your edits. Make sure this is what you intended. This will likely increase the time it takes for your changes to go live.
Comment and Save
Until you earn 1000 points all your submissions need to be vetted by other Comic Vine users. This process takes no more than a few hours and we'll send you an email once approved.