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12 Episodes 2000 - 2001
Episode 1
Episode 2
Episode 3
No one quite knows what happened in the tropical aquarium of a German zoo two decades ago, but according to biologists, experiments with a tropical seaweed unleashed a hybrid algae which is now decimating marine life in the Mediterranean. It was in the late 1980s that Alexandre Meinesz, a professor of biology at France's University of Nice-Sophia Antipolis on the Mediterranean coast, first detected the spread of a new species of algae along the French coastline. Horizon follows Meinesz on a scientific detective story as he attempts to unravel the source of this alien algae, alert the authorities to the danger and find a solution.

Episode 4

Episode 5
A controversial theory posits that for millions of years Earth was entirely ice covered.
Episode 6

Episode 7
The discovery of a mummified girl, with a full inscription identifying her as a 'lost' Persian princess creates scientific excitement as mummification is unknown in ancient Persia. When forensic scientific analysis reveals that the mummy is nowhere near as old as it should be, the scientists find themselves attempting to solve a murder, and eventually uncover a gruesome secret which may hold the clues to many more unsolved crimes.

Episode 8

Episode 9

Episode 10

Episode 11
Episode 20
