The Incredible Hulk #112

The Hulk finds himself in the middle of a planetary civil war as some of the aliens who have been enslaved by the powerful Galaxy Master join in his fight to destroy the alien monster. Once he succeeds in defeating his foe, the Hulk is put on a rocket back to Earth but the ship has not been properly decompressed and our hero finds himself in a bit of a pickle as he turns back into Bruce Banner whose puny body cannot handle the pressures of deep space.