The Walking Dead actor Benedict Samuel has been cast as Jervis Tetch, A.K.A. the Mad Hatter in Fox's Gotham, according to Deadline.
In comic books, the Mad Hatter uses mind control devices and hypnotism to manipulate others to help him commit crimes. It has not been reported in which episode Benedict will debut as Tetch, nor in how many episodes he will appear.
Gotham season 3 premieres September 19 on Fox.