Major Story Arcs
Dexter is on duty when The Flash comes to the Flash Museum in search of a weapon called The Summoner. Dexter is happy to show Flash where the Summoner is, but is horrified to discover it is missing. Later when the Flash is battling Vandal Savage, Dexter shows up with the blue prints for the Summoner that the Flash asked for. With these blueprints the Flash is able to defeat Savage.