Justice League #21
In "Endless, Part Two," the Flash and Batman race against time—literally—after traveling further back to prevent a catastrophic failure in a power source demonstration. With the rest of the Justice League locked in battle with an alien, the duo uncovers a sabotage plot, forcing a tense reunion to avert disaster. Written and illustrated by Bryan Hitch, with cover by Bryan Hitch, this 2017 issue delivers high-stakes urgency and sharp teamwork.
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Having traveled back in time even further, the Flash explains to Batman the problem, and the two leave the rest of the Justice League fighting an alien to try and figure out what goes wrong with the power source demonstration before it happens. They uncover a plot to sabotage the demonstration and the League regroups to try to stop the explosion, but all that was needed was rejoining the alien tech powering the energy source with its owner, the alien with whom the League had just fought.
Plot details indexed by the Grand Comics Database (CC BY-SA).