through the looking glass is basically the sequel to alice in wonderland. she goes through a mirror into another world
its not in the disney movie but there are other movies with it in it
Heres a summary of the book:
Alice ponders what the world is like on the other side of a mirror, and to her surprise, is able to pass through to experience the alternate world. She discovers a book with looking-glass poetry, "Jabberwocky," which she can read only by holding it up to a mirror. Upon leaving the house, she enters a garden, where the flowers speak to her and mistake her for a flower. There, Alice also meets the Red Queen, who offers a throne to Alice if she just moves to the eighth rank in a chess match. Alice is placed as the White Queen's pawn, and begins the game by taking a train to the fourth rank, since pawns in chess can move two spaces on the first move.
She then meets Tweedledum and Tweedledee, of whom she knows from the famous nursery rhyme. After reciting to her the long poem "The Walrus and the Carpenter," the two proceed to act out the events of their own poem. Alice continues on to meet the White Queen, who is very absent-minded and later transforms into a sheep.
The following chapter details her meeting with Humpty Dumpty, who explains to her the meaning of "Jabberwocky," before his inevitable fall from the wall. This is followed by an encounter with the Lion and the Unicorn, who again proceed to act out a nursery rhyme. She is then rescued from the Red Knight by the White Knight, who many consider to be a representation of Lewis Carroll himself. He repeatedly falls off his horse, which is probably a reference to the L-shaped move knights make in chess.
At this point, she reaches the eight rank and becomes a queen, and by capturing the Red Queen, puts the Red King (who has remained stationary throughout the book) into checkmate. She then awakes from her dream (if it had been a dream), and blames her black kitten (the white kitten was wholly innocent) for the mischief caused by the story. The two kittens are the children of Dinah, Alice's cat in the first book.