In Chapter IV of the book, an owl speculates that the Lady of the Green Kirtle – the enchantress of the Underworld – may be "one of the same crew" as the White Witch from The Lion, The Witch, and the Wardrobe and The Magician's Nephew. Some readers have suggested that she may in fact be the White Witch brought back to life. The cast of characters introduced by later editors seems to promote this, but it is not supported by Lewis's text. The Lady of the Green Kirtle is a were-snake, and it is never implied in any of the books that Jadis or the White Witch possess this attribute. (See the Lady of the Green Kirtle for more discussion.)
The manner of Rilian's confinement to a chair recalls the imprisonment of Theseus and Pirithous in the Underworld when discovered there by Heracles on his twelfth and final labour, the abduction of Cerberus.
