Sneak Peek extended footage from the "Gotham" Season 5 episode "Ace Chemicals", featuring 'Joker' (Cameron Monaghan) and 'Mad Hatter' (Benedict Samuel), airing February 21, 2019 on Fox:
"...'Gordon' races to uncover the criminal element threatening to end talks of the unification of 'Gotham' with the mainland.
"Then a very much alive 'Jeremiah' (Monaghan) returns and organizes a twisted recreation of the murder of the parents of 'Bruce' with the help of 'Jervis Tetch' aka 'Mad Hatter' (Samuel)..."
Click the images to enlarge and Sneak Peek "Gotham: Ace Chemicals"...