For six hundred years, Mallow has led a group of marauders in attacks against settlements across the outer planets of Sector 0614, leaving no survivors. Their headquarters, Fort Pierce, is located within a violent asteroid storm. At some point Mallow was chosen to join the Sinestro Corps.
Mallow was among the thousands on Qward during the capture of Green Lantern Kyle Rayner, and Rayner's forcible separation from the Ion entity. Parallax was then able to graft himself onto Rayner. Mallow's activities during the Sinestro Corps War have yet to be documented. It is not known if Mallow is still at large or if he is being held in the Sciencells on Oa.