In 2004, DC began laying the groundwork for a full continuity-reshuffling sequel to "Crisis on Infinite Earths", promising substantial changes to the DC Universe (and side-stepping the 1994 "Zero Hour" event which similarly tried to ret-con the history of the DCU). In 2005, the critically lauded "Batman Begins" film was released; also, the company published several limited series establishing increasingly escalated conflicts among DC's heroes, with events climaxing in the "Infinite Crisis" limited series. Immediately after this event, DC's ongoing series jumped forward a full year in their in-story continuity, as DC launched a weekly series, "52", to gradually fill in the missing time. Concurrently, DC lost the copyright to "Superboy" (while retaining the trademark) when the heirs of Jerry Siegel used a provision of the 1976 revision to the copyright law to regain ownership.