Terry Pratchett's The Colour of Magic - Plot

Plot

The plot of the adaptation largely follows the first two Discworld novels, The Colour of Magic and The Light Fantastic. The story follows the exploits of Rincewind, a wizard who is expelled from Unseen University after spending 40 years failing to learn even the most basic magic. In fact, Rincewind's head holds one of the eight spells from the Octavo, the most powerful spellbook in the Discworld, and he has been unable to learn others because "they were afraid to be in the same head" as the Octavo spell. Rincewind is forced to act as a local guide for Twoflower, a property insurance salesman and the Discworld's first tourist, who is visiting Ankh-Morpork, and Twoflower's luggage, which is made from sapient pearwood and can run on its own legs.

After a misunderstanding over an insurance policy causes the owner of the inn where Twoflower and Rincewind are staying to commit arson, the pair flee the city. They proceed across the disc, encountering a variety of mythical creatures, most of which lead to near-death experiences. Fortunately for Rincewind, the Octavo spell in his head precludes him from actually dying, resulting in several comic encounters with Death. Meanwhile, a significant power struggle is occurring within Unseen University. Narrator Brian Cox explains that "in the competitive world of wizardry, the way to the top is via dead men's pointy shoes... even if you have to empty them yourself". The power-hungry wizard Ymper Trymon (Tim Curry) plans a battle for supremacy with the Unseen University's other senior staff members in a bid to become Archchancellor. Trymon assassinates several faculty members but is thwarted by the incumbent Archchancellor, Galder Weatherwax, and his superior magical knowledge of the Octavo. Trymon knows there is no point in deposing the Archchancellor until he learns how to control the Octavo, which is growing increasingly restless as Rincewind (and the spell in his head) moves away from Ankh-Morpork and into greater danger.

Rincewind and Twoflower are eventually washed rimwards to the kingdom of Krull, which lies on the very rim of the disc, where they are taken prisoner. The astronomers and "astrozoologists" of Krull have for many years attempted to determine the sex of Great A'Tuin, and are on the verge of launching a space vehicle to carry a pair of "cosmochelonians" on a new mission over the rim of the disc. Unaware of this, Rincewind and Twoflower take the place of the two cosmonauts and 'escape' to the spacecraft, which they accidentally launch, catapulting them off the rim. The prospect of losing the eighth spell in this fashion prompts the Octavo to act, causing A'Tuin to perform a barrel roll to recapture Rincewind, landing the pair near the centre of the disc. Watching the Octavo's action, the Archchancellor reveals his intention to use the Rite of AshkEnte to ask Death about the Octavo and also about a large red star that has recently appeared in the sky. Now knowing all he needs, Trymon throws Weatherwax from the Tower of Art and becomes Archchancellor in his place.

The red star grows steadily larger, and the worried people of Ankh-Morpork mob the Unseen University because the wizards appear unable to save the disc from it. Trymon learns from Death that all eight spells of the Octavo must be said together at the solstice to save the disc from destruction. Trymon dispatches a group of mercenaries, led by Herrena, to capture Rincewind and retrieve the eighth spell, along with a force of wizards. Meanwhile Rincewind and Twoflower encounter Cohen the Barbarian (87 years old, retired), and Twoflower rescues Bethan, a human sacrifice in a druid ritual. A battle between the wizards and Rincewind leaves Twoflower in a coma; Rincewind rescues him from Death's door, and Cohen in turn rescues Rincewind and Twoflower from Herrena and the mercenaries.

The four take a ferry to Ankh-Morpork, where the populace is rioting because the star is now larger than the disc's own sun. Trymon assembles the senior wizards of the University, and orders them to unchain the Octavo. When they release the spellbook, Trymon steals it and locks the wizards in its chamber. Rincewind releases them and they follow Trymon to the top of the Tower of Art, afraid that he will attempt to say the spells and that they will destroy his mind (and the rest of the world). Trymon, however, says the spells successfully and gains near-ultimate power, and turns the wizards to stone. Rincewind fights Trymon, who is eventually killed, returning the spells to the Octavo. Rincewind expunges the eighth spell from his head, completing the set, and reads the entire spellbook.

The star is finally revealed as a world-turtle breeding ground: the Octavo spells prompt several eggs orbiting the star to hatch into juvenile discworlds, which follow Great A'Tuin as it returns to deep space. The narrator tidies up a few loose ends: the Octavo is eaten by the luggage, which Twoflower donates to Rincewind. Rincewind himself re-enrolls at Unseen University, while Twoflower returns to the Counterweight Continent, and Cohen and Bethan decide to get married, with Cohen celebrating by commissioning some dentures, made entirely out of troll's teeth (pure diamond) and planning to settle with a gift from Twoflower of a dozen pure gold coins.