The Lich is still referred to by his old name, Lich King, in various official episode summaries and clipdescriptions on Cartoon Network's site, indicating that the name change may have been done very late in production.
The original name, Lich King, was only changed because this name already belonged to a World Of Warcraft character, and Frederator Studios was afraid that they would be sued.
In fantasy fiction, a lich is a powerful magician who has transformed himself into an undead creature to achieve immortality.
The Lich is the first character Finn and Jake have faced that has endangered the fate of the world.
The Lich was redesigned at least once; the creators felt that his original design wasn't scary enough.
The Lich's final design is similar to that of the Horned King from the Disney film The Black Cauldron, which is an adaptation of the novel The Book of Three.
On CartoonNetwork.com, you can set your profile picture as the original Lich.
Pendleton Ward originally wanted to cast Tom Waits as the Lich.
In "King Worm," he makes his second normal body. He is also seen, as the snail, at the end of the episode behind Finn after defeating King Worm.
In France/Belgium, there was a translation problem with Lich King's name. During his appearance in "His Hero," he is called " Le Roi sangsue," which translates to "Leech King."
