Marvel The Incredible Hulk 72

Cover by Mike Deodato, Jr. "Big Things, Part 2 of 4: Strange Bedfellows," script by Bruce Jones, art by Mike Deodato, Jr.; Stark asks Bruce to help him with an experiment involving gamma radiation; The Hulk squares off against the Invincible Iron Man. 36 pages., full colour. 

Tony Stark sees Bruce Banner's help with a Gamma Radiation experiment

Hulk vs Iron Man.