Major Krantz commanded the basic crew charged with finishing the construction of Babylon 4 in 2254. Twenty-four hours after the station went completely online, it began picking up strange readings and suddenly all its sensors went off line. The station was pulled into a spacetime anomaly, becoming as Krantz would put it "unstuck in time." The station's security discovered a prisoner during the journey through time, a strange alien named Zathras. They also saw another intruder who appeared and disappeared at will.
When the station returned to normal space, Krantz sent out a distress call picked up by Babylon 5. Cmdr. Jeffrey Sinclair lead a large rescue team aboard shuttles to help evacuate the station. When he came aboard, Krantz told him what had happened and learned that it was now 2258. They began coordinating the evacuation. They also interrogated Zathras, who explained he and his allies were responsible for stealing the station--dragging it through time to be used in a Great War. Despite Zathras's protest that to remove him would kill him, Major Krantz insisted on bringing him along anyway as proof of what happened. However, while heading for the final shuttle out, Zathras was trapped by falling debris. Krantz and the others were forced to leave him behind and safely made it off the station.