Original Sin: Hulk vs. Iron Man

In this 2014 Marvel one-shot, writers Kieron Gillen and Mark Waid team up with artist Luke Ross to pit two of the Marvel Universe's heaviest hitters against each other during the "Original Sin" event. The story delves into the hidden secrets between Hulk and Iron Man, forcing them to confront a dark moment from their shared past that neither remembers clearly. This issue matters as a compact, character-driven clash that uses the event's premise to explore the fractured trust between these longtime allies.