Harley Quinn has a tough road ahead: travel through time and space to fix all the continuity errors she's created in her many misadventures. Luckily, she'll have help, because riding shotgun is none other than special guest star Jonni DC, Continuity Cop! Good thing, too, because if Harley fails, it means her own mom will be lost forever. Hey, that sounds more painful than funny! Learn more in these tales from HARLEY QUINN #50-54.