Avengers #20

The "Ultron Unlimited" saga continues in this September 1999 chapter, and George Pérez's cover makes the threat immediately overwhelming — a lone figure in white fires a brilliant energy beam into a seemingly endless army of Ultron robots, with the Scarlet Witch struggling nearby amid the mechanical tide. The roster box along the left edge hints at the broader team waiting in the wings, but right now two Avengers look drastically outnumbered against that gleaming, relentless horde. It's a masterfully composed image of desperate odds that sets the tone for "This Evil Unfolding" perfectly.