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Last time, in 2010,

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a crew went back to Jupiter,

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found the ship Discovery,

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and woke up its computer, HAL.

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Then Jupiter collapsed into a second sun,

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and a message reached Earth:

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all these worlds are yours, except Europa.

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Dave and HAL vanished into the monolith.

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There are no more movies,

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but Arthur C. Clarke wrote two more

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books, 2061 and 3001.

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Clarke called them variations on a theme,

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so some details change from book to book.

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This is part three.

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Spoilers ahead!

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It's 2061, fifty-one years later.

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Heywood Floyd is now a hundred

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and three years old.

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He lives on a space station

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in orbit, where low gravity

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has kept him healthy for decades.

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Most people his age would

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be long gone.

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But Floyd still

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has one more big trip ahead of him.

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Out in the solar system,

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Jupiter now shines as a small sun,

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and people call it Lucifer.

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Its warmth is melting Europa's ice

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into an ocean,

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and thick clouds now hide the moon from view.

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Nobody has dared to land there.

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The warning from 2010 still stands:

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Europa is off limits.

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Floyd is invited on the first voyage

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of the Universe,

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a luxury spaceship with famous passengers on board.

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It's headed for Halley's Comet,

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which swings past the Sun

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about every seventy-six years.

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Floyd saw it once before,

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back in 1986,

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as a young man.

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Now he gets to see it

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a second time.

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The Universe lands on the comet's dark, icy core.

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Floyd steps out and becomes one

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of the first people ever to walk

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on Halley's surface.

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As the comet warms

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up near the Sun,

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jets of gas and dust burst out

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of the ground like geysers.

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That's where a comet's glowing tail comes from.

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Meanwhile, Floyd's grandson Chris is an officer

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on another ship, the Galaxy.

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It's exploring the moons of Jupiter,

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flying from one

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to the next to study them up close.

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It's a quiet science mission.

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Everything seems routine,

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until one of the crew turns out

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to be hiding a secret.

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A stewardess named Rose suddenly takes control

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of the Galaxy.

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She forces the pilot to steer

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for Europa, the one world humans

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were warned to stay away from.

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She won't say why.

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It seems someone back

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on Earth badly wants

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to know what's hidden on that moon.

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The landing goes wrong.

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The Galaxy comes down hard and splashes

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into Europa's new ocean.

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The crew survives,

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but the ship can't take off again.

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They're stranded.

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As the Galaxy floats,

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they spot something huge near the shore:

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a mountain that glitters in Lucifer's light.

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It's called Mount Zeus,

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and it's made of solid diamond.

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Deep inside Jupiter,

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crushing pressure had turned carbon into diamond.

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When the planet collapsed,

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a chunk of its core

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was blasted out and landed on Europa.

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A diamond the size

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of a mountain could shake

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up Earth's whole economy.

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That may be why someone wanted

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to get there first.

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The only ship that can reach them

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in time is the Universe,

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still out near Halley's Comet.

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Its captain turns around and races

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toward Jupiter at top speed,

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with Floyd on board.

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Now Floyd is flying to save

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his own grandson.

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After a long chase,

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the Universe lands on Europa,

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right next to the stranded crew.

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While they wait,

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the crew glimpses Europa's new life:

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strange creatures crawling out of the sea.

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The rest of the crew gets home

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safely, and the Europans are left in peace.

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But someone was watching all along.

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Inside the monolith,

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Dave and HAL are guarding the Europans.

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And in about a thousand years,

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humans will be judged.

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Now jump ahead a thousand years,

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to the year 3001.

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Out past Neptune,

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a space tug called Goliath

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is collecting ice comets.

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Instead, its crew finds

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a frozen body drifting in the dark.

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It's Frank Poole,

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the astronaut HAL sent spinning

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into space back in 2001.

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He's been floating out there

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for a thousand years.

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Doctors of the future bring Frank back

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to life, which takes months

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of careful work.

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When he finally wakes up,

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he's the only person alive

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from the year 2001.

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His guide is a historian named Indra Wallace.

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She helps him catch

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up on a thousand years

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of history he slept through.

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Earth looks different now.

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Four giant towers rise

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from the equator all the way

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up into space.

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At the top,

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they hold up a ring

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around the whole planet,

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a city in orbit where people live and work.

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Elevators run up and down the towers,

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so nobody needs a rocket

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to reach space.

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Instead of phones or screens,

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people wear BrainCaps,

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which connect their minds straight to computers.

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To wear one,

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you have to shave your head.

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Frank tries one,

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and information pours straight into his brain.

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It's like the internet he knew,

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except the screen is inside his head.

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Frank wants to see the place

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where his old mission ended.

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So he joins Captain Chandler

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of the Goliath on a trip out

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to Jupiter's moons.

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Humans now live on Ganymede,

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under the light of Lucifer.

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From there, Frank looks across at Europa,

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the one world that's still off limits.

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Frank flies down to Europa,

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and something reaches out to him.

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It's Dave Bowman,

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or a copy of him,

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living inside the monolith.

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Dave and HAL have merged

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into one mind, called Halman.

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For a thousand years,

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Halman has been inside the machine,

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quietly learning how it works.

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Halman explains the truth.

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The monolith is not a god.

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It's a machine,

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built by unknown makers far out among the stars.

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Back in 2001,

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when humans dug up the monolith

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on the Moon,

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it sent a report about us.

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That message took centuries to arrive,

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and the answer took centuries

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to come back.

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Now the answer has arrived,

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and it's bad news.

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The makers have judged humans

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to be dangerous,

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and the monolith's new orders

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are to wipe out humanity.

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The same machine that taught apes

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to use tools now plans to end the story.

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Humans have very little time

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to fight back.

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But humans have dangerous tools

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of their own.

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Deep inside a mountain

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on the Moon called Pico,

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there's a sealed vault.

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It holds the most dangerous computer viruses

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ever made, locked away

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so they can never escape.

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Frank's team carefully takes out the worst of them.

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Halman carries the viruses into the monolith,

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hidden inside himself,

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like the Trojan horse

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in the old Greek story.

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The plan works.

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The virus spreads from one monolith

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to the next,

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and they shut down for good,

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before they can strike.

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Humanity is safe,

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at least for now.

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So that's the whole odyssey,

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across four books and a thousand years.

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A monolith taught apes to use tools.

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Another called humans to Jupiter.

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A third turned Jupiter into a sun.

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And in the end,

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humans used their own tools

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to stop them.

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Clarke ends with a hint

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that the makers may notice someday.

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Until then, the future belongs to us.