The Avengers comic #2 from Marvel Comics
Besides thinking the original Avengers was the best group ever, I really like this cover because of the way they showed you that it was the Space Phantom disguised as the Hulk.  Not sure why but I always thought that looked really cool.

       

This is a scan of an old comic book. This item is not for sale. But you can find it on ebay. Click below to go to ebay and search!