Bureau of Missing Villains

Batman's Bureau of Missing Villains was a series of case files maintained by Batman on so-called "missing villains", minor criminals whom he'd fought and defeated early in his career but had since vanished into obscurity. The files were first published as part of the short-lived Batman Family mini-series which ran from 1975 to 1978.

Many of the missing villains had either retired, died, or were simply incarcerated for an extended period; however, a few such as Matthew Hagen and Basil Karlo, the first and second Clayfaces, did return to Gotham City at a later point and face Batman again.