Incredible Hulk, The (1968 series) #368

Bruce Banner, in pursuit of Doc Samson and the Army, ducks into the empty car of a train just as it's starting to leave the yard. As the train begins moving, a voice from the shadows recognizes Bruce, and they start discussing the finer points of Robert Louis Stevenson's Dr. Jekyll and Mr. Hyde. The voice, emerging from the shadows and revealing himself to be Mr. Hyde, grabs Bruce and declares that there isn't room in this reality for two Mr. Hydes.

Bruce transforms into the Hulk to defend himself, even though he notices that the sun hasn't fully set yet. Hyde, noticing that the sunlight bothers the Hulk, suggests that it's because the Hulk is ashamed to be seen—which is why he only comes out at night—or that Banner only lets the Hulk out at night so that the shadows can keep him hidden. Hyde continues the taunts, goading the Hulk into a fight of strength versus strength.

The fight results in the end cars of the train derailing, toppling over the edge of a precipice. The Hulk tosses Hyde aside and catches the train just in time. Hyde grabs onto the end of the dangling train, and because the Hulk chooses to save the people in the cars rather than kill Hyde, more taunts are thrown. Hyde exclaims how much stronger he is because he doesn't care about the weaklings like the Hulk does. Hyde then lets go of the train, saying Bruce and the Hulk deserve each other.

The Hulk brings the train to safety, allowing Hyde to fall into the darkness, leaving the Hulk behind to reflect on all that was said. In the meantime, Prometheus, a member of the Pantheon, emerges from his mountain headquarters in a high-tech car, racing toward the Hulk.