Scholars, including psychoanalysts, have commented that J. R. R. Tolkien's Middle-earth stories about both Bilbo Baggins, protagonist of The Hobbit, and Frodo Baggins, protagonist of The Lord of the Rings, constitute psychological journeys. Bilbo returns from his journey to help recover the Dwarves' treasure from Smaug the dragon's lair in the Lonely Mountain changed, but wiser and more experienced. Frodo returns from his journey to destroy the One Ring in the fires of Mount Doom scarred by multiple weapons, and is unable to settle back into the normal life of his home, the Shire.
Bilbo's journey has been seen as a Bildungsroman, a narrative of personal growth and coming-of-age, and in Jungian terms as a journey of individuation, developing the self. Frodo's journey has been interpreted both as such a Jungian development, and in terms of the psychoanalytic theories of Melanie Klein and Lev Vygotsky. Jungian interpretations have identified numerous figures who correspond to archetypes, such as Gandalf and Saruman as the Wise Old Man, Gollum as Frodo's shadow, and Denethor and Théoden as the Old King, while Gandalf, Elrond, Galadriel and Gollum have all been described as guide figures. Several features of The Lord of the Rings have been interpreted as Jungian mandalas, figures of the self; one such is the group of four Hobbits, who may collectively represent the ego with its four cognitive functions. In Klein's theory, Frodo oscillates between the paranoid-schizoid and depressive positions, striving to resolve internal conflicts. In Vygotsky's theory, the journey is towards death, which Tolkien acknowledged as the theme of his book.