For the world with a similar name, see Underworld.
Inside a tree stump, the Caterpillar runs an underground business known as Underland. He often lends money to other people, notably Knave, in exchange for return payments. The Caterpillar's employees are called Collectors, and they retrieve debts from lenders for him. In the cases the money owed is not returned, the Collectors will capture and bring the person to the Caterpillar. After losing the love of his life, Knave helps a homeless girl, Lizard, get off the streets and they begin work as Collectors. Amassing many debts to the Caterpillar, Knave later disappears without paying everything back, to which his former employer puts a wanted poster for his capture. Lizard, meanwhile, continues to work for the Caterpillar. ("Forget Me Not")
The Caterpillar, willing to forgive Knave's past debts, agrees to do so only if he steals a knot for him. Instead of turning in the retrieved item, Knave burns it. Gaining knowledge from the former knot owner about Knave, Jafar heads to Underland and asks the Caterpillar for information about the man, who poses a threat to his plans for Alice. Annoyed at Knave's broken deal, the Caterpillar sends some of his Collectors, including Lizard, after him. Unable to disobey her employer, despite that Knave is her old friend, she follows his command. Alerted to the Collectors' presence, Knave and Alice agree to meet at Tugley Woods once they split up and outrun their pursuers. After running and hiding behind a bush, he is almost cornered by the Collectors until the Red Queen knocks them unconscious and kidnaps him. Upon awakening, Lizard returns to Underland's entrance, where she sees Alice searching the outside grounds for Knave. Once Alice learns from her that he's been taken by the Red Queen, she goes to rescue him as Lizard joins her. ("Forget Me Not", "The Serpent")
- The Underland has many aspects in common with Jabba the Hutt's palace from Star Wars: Return of the Jedi, such as being run by a sluglike, hookah-smoking crime boss who sits on a dais, being a meeting point for bounty hunters, having musicians and dancers, and having a bad reputation. ("Forget Me Not", "The Serpent")
- The name "Underland" is a reference to the Tim Burton movie Alice in Wonderland, where Wonderland is actually named Underland. ("Forget Me Not")
|Once Upon a Time in Wonderland|
|"Down the Rabbit Hole":||"Trust Me":||"Forget Me Not":||"The Serpent":||"Heart of Stone":||"Who's Alice":||"Bad Blood":|
|"Home":||"Nothing to Fear":||"Dirty Little Secrets":||"Heart of the Matter":||"To Catch a Thief":||"And They Lived...":|