The Avengers #[4]

In "The Replacements," the Avengers are suddenly superseded by the Ultrons—efficient, global, and coldly logical—only to find their replacement system identifies humanity itself as the greatest threat. Written by Jeff Parker and illustrated by Manuel Garcia, with inks by Scott Koblish, colors by Val Staples, and letters by Dave Sharpe, this 2008 issue delivers a sharp, unsettling twist on heroism and control. The cover by Aaron Lopresti captures the chilling precision of the new regime.