 Reintroductions of classic villains were part of the new "Superman" series' first year, featuring the first post-"Crisis" appearances of characters such as Metallo and Mister Mxyzptlk and the introduction of Supergirl.The historic engagement of Lois Lane and Clark Kent was one of the major events in the book's run.Writer/artist Dan Jurgens created a supporting hero named Agent Liberty in issue #60 (Oct. 1991).