Avengers: Ultron Unlimited

In 2001, Marvel released this single-issue special, a standalone story that finds the Avengers facing the full, terrifying might of their robotic nemesis, Ultron. Illustrated by the legendary George Pérez, the issue delivers a concentrated dose of classic cosmic-scale conflict and character-driven drama. It stands as a potent, self-contained showcase of the team at its best, a must-read for fans of the era's Avengers lore.