The Clone Arc is a storyline that encompassed the investigation, eventual discovery, and thwarting of a plot to mass produce clones of various people throughout the multiverse. The unofficial name given to the storyline at one point was Darkness on the Horizon as there was little known about what was happening at first, and the entire arc alludes to a much larger and more sinister plot at work. Preceded by: Terra Stabilization Proceeded by: Celestial Upheaval