He lives in Wonderland with Tweedledee and Tweedledum and other Wonderland characters.
Alice appeared to Lisa in a vision and told her visiting a library was a trap and to continue trying to be cool, the Hatter then pointed a gun to her head. Lisa and Maggie read a pop up book of Alice in Wonderland.
- Episode – "Summer of 4 Ft. 2"
- Episode – "O Brother, Where Bart Thou?"
- Comic book – Lisa's Adventures in Wordland (portrayed by Robert Terwilliger, as the Man Who Swallowed a Dictionary)