In 2010, Justice League: Crisis on Two Earths introduced the Crime Syndicate including its ruthless leader Ultraman. While evil versions of the Justice League such as the Justice Lords had been introduced previously, these thugs took it to a whole other level of nasty.
Like Supes, Ultraman also had a vulnerability to kryptonite, however his weakness was to the blue variety.
While the excellent movie was more of a Batman / Owlman spotlight, it did provide screen time to parallel versions of Superman's supporting cast including the leader and sole surviving member of the alt Justice League, Lex Luthor and Ultraman's Pal, Mr Action.
Check back next week for another chapter in The Super History of Superman.