"Crisis on Infinite Earths" is a 1985–1986 American comic book crossover storyline published by DC Comics. The series, written by Marv Wolfman and pencilled by George Pérez, was first serialized as a 12-issue limited series from April 1985 to March 1986. As the main piece of a crossover event, some plot elements were featured in tie-in issues of other publications. Since its initial publication, the series has been reprinted in various formats and editions.

The Monitor or Over-Monitor, also known as Mar Novu, is a fictional character created by writer Marv Wolfman and artist George Pérez as one of the main characters of DC Comics' Crisis on Infinite Earths limited series.