In an interview with CBR News about what viewers can expect in "Gotham" Season 3, executive producer John Stephens revealed some key villains that are on the way to the series.
"We'll be seeing Mad Hatter in Season 3. We'll be seeing the Tweedle Brothers, too, if we're going to bring the Hatter in. In line with the Court of Owls, we'll be seeing Talon. And, we should be seeing Solomon Grundy," Stephens told CBR during a discussion of the Season 2 finale.
Stephens previously hinted at the perpetually-rhyming Mad Hatter (a.k.a. Dr. Jervis Tetch) for Season 2, in addition to Clayface, who'll be causing trouble in tonight's season finale, but it looks as though they ultimately chose to hold off on the character for the upcoming Season 3 instead. Tetch is a scientist that uses his own mind-control control technology to control the minds of his victims. Though based on a children's book character, the character is sometimes portrayed as being severely mentally ill, with an underlying darkness to him.
As for Solomon Grundy, viewers speculated he cameoed in the "Unleashed" episode of Season 2 from a couple weeks back as the unidentified hulking, and grunting, prisoner at Indian Hill (though we also speculated that it could have been Killer Croc). The zombified villain has made countless appearances in animated DC adaptations, in addition to "Smallville" and "Arrow." A surprisingly old character -- having debuted in 1944 -- Grundy is the corpse of a merchant that was reanimated as a large zombie-like abomination. Aside from his super-strength, it's suggested in the comics that he is indestructible and immortal.
The "Alice in Wonderland"-themed Tweedle Brothers have yet to be teased on the series, but it's easy picturing them as a one-off villains-of-the-week in Season 3. The criminal twins have been known to team-up with Mad Hatter, in addition to the Joker. Though they don't tend to have super-powers beyond heightened strength, Tweedledum and Tweedledee headed their own "Wonderland Gang" of thugs using Tetch's mind-control technology in the comics.
Perhaps the most interesting on the list is Talon, who -- as Stephens referenced -- is a fairly new creation, from Scott Snyder and Greg Capullo's 2011 "Court of Owls" storyline. Talon (a.k.a. William Cobb) is a highly-skilled assassin that was sent to assassinate Batman on behalf of the Court. He went on to star in his own series by Snyder, James T Tynion IV and Guillem March. Stephens has suggested that the Court of Owls will be playing a major role in Season 3.
The "Gotham" Season 2 finale airs Monday at 8/7c, and returns for a new season this fall, on FOX.