Résumé: Trapped in another dimension, the Golden Age Flash must team-up with the Modern Age Green Lantern, and the Golden Age Green Lantern must team-up with the Modern Age Flash, in order to avert an alien invasion of Earth. Interestingly, the younger heroes seem to have switched powers. Written by Mark Waid and Brian Augustyn, with pencils by Val Semeiks and inks by Chip Wallace.