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Frank Gorshin, Anthony Perkins and Davy Jones (of the monkees) are Batman 1966's version of The Riddler, The Scarecrow and The Mad Hatter. I know the '66 show had David Wayne as The Mad Hatter, but he's not that exciting. So David Wayne is the imposter hatter and Davy Jones is the reason Hatter. Really, this is going to stay in my head as the Batman '66 version of these three forever. Frank Gorshin, Anthony Perkins and Davy Jones. I think it'd be a great pairing to have seen on stage together. They all seem like great performers. I think art of The Mad Hatter snd Scarecrow modelled after Davy Jones and Anthony Perkins would be great, honestly.
But Davy Jones had to be the Mad Hatter. Short and British, he even sort of sounds like Peter Macnicol doing The Mad Hatter for the batman arkham games. And also, well, daydream believer sounds like a Mad Hatter song. Soft yet almost ethereal, it's perfect. A batman 66 episode with the mad hatter would have to have that song worked in somehow (even if we just have the hatter humming it).