In Robin: Year One, Tetch devised a plan to implant his mind control devices in portable tape players, which he gave out to young girls at Dick Grayson's school in order to sell the young girls to millionaire third-world dictator Generalissimo Lee. Once again, Tetch was stopped by Batman, but not before using his advanced equipment to feed information from Fox's mind into his computer.

Tetch has even kidnapped Lucius Fox of Wayne Enterprises and held him for ransom. Tetch seemed to have died under the wheels of a train, but that turned out to have been another trick. He even managed to slip one into Scarecrow's hat and take control of him for a short time. It was in 1983's Detective Comics #526 that Tetch was first portrayed with the mind-controlling devices for which he is now best known. Tetch claimed to have killed his impostor, but that turned out to be untrue when the impostor returned one last time in Detective Comics #573 in 1987. Tetch appeared with a pet monkey, as well as a mind-erasing machine. The real Jervis Tetch reappeared in Detective Comics #510 in 1981.

Later a very different Mad Hatter appeared, claiming to be Jervis Tetch, but he was revealed as an impostor and subsequently disposed of once the real Tetch re-appeared. Tetch was subsequently sent to Arkham Asylum. In his first appearance, the Mad Hatter attempted to steal a trophy from the Gotham Yacht Club, but was foiled by Batman while he tried to rob spectators from a high society horse show. He is an insane neuroscientist and developed hardware that can control the brain and induce hypnotic states, and often uses hats or other headgear for mind control. As his criminal name indicates, he takes the appearance of the Mad Hatter from Alice's Adventures in Wonderland. Jervis Tetch, formerly a research scientist, is completely smitten with the works of Lewis Carroll.

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