Season 1 Episodes8
Cast1

David Attenborough
Self - Narrator (voice)
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Ranked #8 of 8 in Season 1•−0.2 vs season avg
As the days grow longer, billions of microscopic plankton bloom under the blazing sun. Here in the temperate seas, three-ton basking sharks graze among forests of giant kelp - the fastest growing plant in the world. The forests harbor thousands of other animals, including sea

David Attenborough
Self - Narrator (voice)
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"Seasonal Seas" is episode 5 of The Blue Planet season 1. It scored 8.0/10 from 1,762 votes, ranking #8 of 8 episodes this season (season average 8.2). It aired on October 10, 2001.