The Incredible Hulk Vol. 1 (1962-1999) #151

Plot

Bruce heads to Washington D.C. to try and enlist Hank Pym's help in shrinking him small enough to reach Jarella's subatomic world; Enraged when he can't track down Ant-Man, Bruce turns into the Hulk and has to fend off a toxic glob that used to be a U.S. senator who was using Hulk's gamma irradiated blood to try and cure his cancer (which obviously turned out to be a bad idea).