Where can I watch “The Blue Planet” Season 1 Episode 5 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

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Watching earlier episodes in season 1 helps you follow the plot and character arcs leading into this episode.

Watch The Blue Planet Season 1 Episode 5 Online

“Seasonal Seas” — Watch "The Blue Planet" Season 1 Episode 5 online in HD for free. Check streaming providers, cast, and episode details.

Oct 10, 2001 Season 1 Episode 5 50 min U

7.7 ★ ★ ★ ★ ★

9 votes

The Blue Planet Season 1

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Season 1 Episode 5 — Aired on Oct 10, 2001 • runs about 50 minutes.

Notable cast/guest names in this episode include David Attenborough.

This page includes 2 official still(s) (when available) plus legal availability links.

Looking for “watch The Blue Planet Season 1 Episode 5 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

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 otters, brilliantly colored anemones, squid, and exquisite leafy dragons. But as the year wears on, storms rage in the icy sea... a desperate challenge for the animals that remain.