http://www.comicbookresources.com/article/spoiler-returns-in-gothams-season-finale-synopsis

SPOILER WARNING: The following article contains major spoilers for the final episodes of "Gotham's" second season. Throughout the show's second season, "Gotham" has seen villains realize their potential in a number of ways. Be it Edward Nygma finding himself becoming the Riddler through his own missteps, Oswald Cobblepot's "family" forcing the reformed crimelord into realizing his destiny as the Penguin, or Victor Fries' love for his wife leading him to transform morally and physically into the ice-cold killer, Mr. Freeze, the villains did indeed rise. Now, it's Fish Mooney's turn. In the season's penultimate episode, "A Legion of Horribles," Jada Pinkett Smith makes her return to the series