The Incredible Hulk #163

Ross is chasing the Hulk through the ice-bound wastes of Canada when they are both captured by the Gremlin. The Gremlin experiments on Hulk, trying to gauge his power levels so he can implement them into his Super-Trooper suits. Trying to control the Hulk through gas, he accidentally causes the Hulk to revert to Bruce Banner. Ross and Banner hatch a plan for Bruce to turn back into the Hulk and escape. Unfortunately, once the Hulk persona returns, he only remembers that he hates Ross and leaves him in the hands of the Russians. Betty learns that the Hulk is alive and her dad has been captured.