The Mad Hatter (Gotham Stories) - Batman: Arkham City (2011)

Disgusted at the crimes Jervis Tetch committed in the guise of the Mad Hatter, Quincy Sharp decreed that Tetch should never see the outside world again.

For months, Tetch was locked in solitary confinement, deep in the bowels of Arkham Asylum's Maximum Security wing. Locked up in the dark without his hats, his tea, and, most importantly, his Alice, Tetch's mind crumbled. Professor Hugo Strange became fascinated by Tetch's case, taking particular interest in Tetch's mind control experiments.

Strange manipulated security procedures, allowing him full access to Tetch behind the warden's back.

If Hugo Strange's plans were going to work, he needed a way to control Quincy Sharp. Having worked with Tetch for months, he had refined and perfected a psychoactive compound that would make anyone who ingested it more malleable and open to suggestion.

The next day, Strange invited Sharp to join him for tea at his office in the Administration Building