Episode guide
Series 1
Conquerors
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Lionfish
The lionfish, which eats other predators, has conquered such a large area of ocean that it has been described as the worst invasive species on the planet.
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Giant Crab of Kamchatka
The king crab, one of the largest shellfish, is depopulating the seabed and changing the balance of species in the ocean.
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Fire Ant
The fire ant has successfully thrived as a result of protecting its territory, confiscating food for itself and fighting with burning venom.
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Pine Processionnary Caterpillar
The pine processionary caterpillar is threatening Europe's forests with its ability to defoliate vast tracts of pines.
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