— A line from It
Maturin is one of the guardians of the Beams that support the Dark Tower. His physical form in Mid-World is presumably a cyborg like Shardik. It is hinted that this Beam is personified in the character of Stephen King. In actuality the turtle's true form is much more grand and powerful. There is evidence of this in several occasions when it has come to aid warriors of The White.
In the Dark Tower story it gives power in the form of the magic object that is left for the Ka-tet known as the Skoldpadda, which has the power to blind and entrance enemies.
The Turtle is said to have vomited out our Universe when it had a stomach ache. IT thought that the Old Turtle Enemy of his died after this.
He bears a resemblance to the World Turtle of Hindu myth. He also has a grandfather-like voice and is shown to be kind and loving. There is a representation of the turtle in Dag Hammarskjold Plaza, a building built to protect the Rose.
The poem written about Maturin is featured prominently within the series. Only the first two lines are mentioned frequently.
- "See the TURTLE of Enormous Girth"
- "On his shell he holds the Earth."
- "His thought is slow, but always kind."
- "He holds us all within his mind."
- "On his back all vows are made;"
- "He sees the truth but mayn't aid."
- "He loves the land and loves the sea,"
- "And even loves a child like me."
- The name Maturin is a reference to Stephen Maturin, a naturalist from the Aubrey–Maturin series of novels, written by Patrick O'Brian. In the books Maturin discovers an unknown species of giant tortoise, which he names Testudo aubreii in honor of his close friend, Jack Aubrey of the Royal Navy .
- In IT, the Turtle is the long time enemy of the creature, It. In 1958, the Turtle communicates with Bill Denbrough for a moment while he is under an illusion created by IT. Bill pleads for help from the Turtle in defeating IT but the Turtle says he does not get involved with those matters. Pleading again, the Turtle simply gives some advice in that he must stand by his friends and perform the Ritual of Chud. In 1985, when Bill and the remaining member of the Losers Club returned to finally kill IT, Bill is told that the Turtle has died sometime after their last meeting in 1958.