- 1 Mega-tsunami: Wave of Destruction
Horizon investigates an extremely rare and destructive phenomenon that strikes every few thousand years: a mega-tsunami.
Air Date: 2000-10-12
- 2 Conjoined Twins
Separating conjoined twins is one of the most challenging operations a surgeon can face. Horizon examines the dilemmas which confront doctors and parents.
Air Date: 2000-10-19
- 3 The Lost World of Lake Vostok
Deep beneath the Antarctic ice sheet lies a vast and ancient lake. Scientists believe that its pristine environment could harbour undiscovered life-forms.
Air Date: 2000-10-26
- 4 Vanished: The Plane that Disappeared
In 1947 a passenger plane, the 'Star Dust', disappeared in the Andes without a trace. Horizon follows forensic scientists piecing together what happened.
Air Date: 2000-11-02
- 5 The Secret Treasures of Zeugma
French archaeologists in Turkey battle to unearth what they can of Zeugma before a dam on the Euphrates covers the great Roman trading city forever.
Air Date: 2000-11-09
- 6 Valley of Life or Death
There's a mystery at the heart of the AIDS epidemic in Africa. Controversially, it seems that circumcision makes people four times less likely to contract HIV.
Air Date: 2000-11-16
- 7 Extreme Dinosaurs
Dinosaurs just got bigger. Huge plant- and meat-eaters have been unearthed in Argentina along with evidence that the mega-carnivores hunted together in packs.
Air Date: 2000-11-23
- 8 Supermassive Black Holes
There's growing evidence that the ultimate force of cosmological destruction - a supermassive black hole - may in fact breathe life into every galaxy in the Universe.
Air Date: 2000-11-30
- 9 The Boy who was Turned into a Girl
The extraordinary story of the Canadian boy who was surgically turned into a girl after birth, offering a fascinating insight into what makes us male and female.
Air Date: 2000-12-07
- 10 Atlantis Reborn Again
Horizon puts Graham Hancock's controversial evidence for a lost civilisation to the test.
Air Date: 2000-12-13
- 11 Life on Mars
Horizon explores how the search for Martians is hotting up.
Air Date: 2001-01-18
- 12 Destination Mars
Tantalising new evidence has emerged that life could exist on Mars. But to find out for sure humans will have to journey to this dry, frozen planet.
Air Date: 2001-01-18
- 13 The Mystery of the Miami Circle
Builders in Miami, Florida unearth a ring of holes. The State then pays $27million to preserve either a Native American village or remnants of a 1950s sewerage system.
Air Date: 2001-01-25
- 14 The Missing Link
A trail from Greenland to Britain via Latvia offers new evidence into how evolution could have seen aquatic life form legs and walk.
Air Date: 2001-02-01
- 15 Killer Algae
A tropical seaweed that escaped from an aquarium is endangering sealife in the Mediterranean and has gone on to infect the California coast.
Air Date: 2001-02-08
- 16 Ecstasy and Agony
Tim Lawrence was an all-action stuntman until hit by Parkinson's Disease. Horizon follows his hopes of a more normal lifestyle using Ecstasy - a class A illegal drug.
Air Date: 2001-02-15
- 17 Snowball Earth
The controversial theory that for millions of years the Earth was plunged into catastrophe - entirely smothered in ice up to one kilometre thick.
Air Date: 2001-02-22
- 18 Supervolcanoes
Beneath America's Yellowstone National Park lies a volcano so colossal that, if it erupts, could threaten the human race with extinction
Air Date: 2001-04-01
- 19 Taming the Problem Child
Two disruptive children are followed through a controversial treatment regime.
Air Date: 2001-03-08
- 20 What Sank the Kursk?
118 sailors died inside the Russian Navy's supposedly indestructible submarine. Finding the causes takes investigators back to a British sub tragedy in the 1950s.
Air Date: 2001-08-08