"Bad guys in this town are changing," says Det. James Gordon in what may be the biggest understatement of "Gotham's" second season.

RELATED: "Gotham's" Azrael Will Be 'Different Than Anything We've Seen in Comics,' Says EP

Mr. Freeze arrives with the series' midseason premiere, and the newest promo for his debut shows that he may be the villain who hews closest to his comic book counterpart to date. In the clip, Freeze attacks several people, leaving frozen bodies and bullets encased in in his wake, while Gordon attempts to piece together the chilling new puzzle.

Starring Ben McKenzie, Donal Logue and David Mazouz, "Gotham" returns Monday, February 29 at 8 pm EST on Fox.