With his long wavy locks and mysterious aura, “The Walking Dead” star Benedict Samuel will not have a hard time convincing people of his portrayal of his "Gotham" Season 3 character, the Mad Hatter.

A busload of villains managed to escape Arkham Asylum during the Season 2 finale of “Gotham,” and one of the escapees was the Mad Hatter.

The Mad Hatter, also known as Jervis Tech, is described as “a talented hypnotist teetering on the edge of madness. He arrives in Gotham with an unwavering desire to find his sister, Alice, a young woman who went missing in the city years ago. It is anyone’s guess just how far down the rabbit hole he’s willing to go in order to find her.”

According to Entertainment Weekly, Samuel will be a season regular and will make his first appearance in episode 3.

Meanwhile, Cory Michael Smith, who plays Edward Nygma in the series, said his character will go on “full-on Riddler” in season 3. “He's such a brilliant mind, and when he decided to frame Jim [Gordon] he came up with this brilliant elaborate plan. Which was by no means flawless - but it was pretty darn good! He kind of went full-on Riddler, but he has no idea what that means,” Smith told Comic Book Resources.

Now that Nygma is out of Arkham, he has a chance at a fresh start. Smith said he has become "aware of what his skill set is," so he will slowly embrace the persona of the Riddler.

There will also be quite a few changes in the character of Poison Ivy, since she will now be played by Maggie Geha instead of Clare Foley.

Executive producer John Stephens told TV Guide that it was essential for them to transform Ivy from a young girl into a sexy and manipulative woman because she is “a character who makes use of her seductive powers to get what she wants in the world.”

“Gotham” will return on Monday, Sept. 19 at 8 p.m. on Fox. Benedict Samuel Benedict Samuel plays Jervis Tetch, also known as the Mad Hatter in “Gotham” Season 3. The actor is seen here attending the screening of IFC Films' “Asthma” by Cinema Society And Northwest. Photo: Getty Images/Jim Spellman