Jellyfish, The new Rulers of the Ocean (2026): Cast, Story and

Prepared by Movies Dock Editorial

Jellyfish, The New Rulers of the Ocean examines the growing frequency and scale of jellyfish blooms, asking why these ancient, brainless creatures are spreading across waters where fish once dominated. The 44-minute documentary considers their impact on tourism, fishing and human health while exploring their overlooked place in ocean life.

Jellyfish, The New Rulers of the Ocean focuses on a striking change in marine ecosystems: jellyfish blooms are becoming more frequent and larger in several parts of the world. The documentary examines why these animals, made up of more than 98% water and lacking a shell, skeleton or brain, are expanding so successfully.

Directed by Sébastien Lafont, this 44-minute documentary approaches jellyfish through oceanography, evolution and underwater wildlife. Its central questions concern what is driving the blooms, why jellyfish have been underestimated, and whether their growing presence could reshape the oceans.

Jellyfish, The new Rulers of the Ocean movie details

Story without spoilers

The film begins with the real-world consequences of jellyfish blooms, which can affect tourism, fishing and human health. From there, it considers the biology of these gelatinous animals and places their recent expansion within the longer history of ocean life.

The documentary looks at jellyfish populations in areas including the coast of Namibia, the Black Sea, the Sea of Japan and parts of the Baltic Sea, where fish have been replaced by jellyfish. It asks whether these developments reflect a normal stage in the animals’ life cycle or point to broader changes in marine environments. The film also explores how jellyfish survived beyond the age of the dinosaurs and why their ecological role has received comparatively little attention.

What to expect

This is a science and wildlife documentary built around ocean research, underwater environments and the evolution of jellyfish. Viewers can expect an educational treatment of jellyfish blooms, their effects on human activities and health, and their presence across several geographically distinct seas.

The premise gives the film an environmental focus without reducing jellyfish to a simple threat. Alongside the damage associated with blooms, it considers the animals’ long history and their place in the ocean. Underwater photography and oceanography are among the film’s supplied subject areas, while the 44-minute runtime suggests a focused presentation rather than a feature-length survey.

Cast and creative team

Sébastien Lafont is the director. Coline Kahr-Aunis and Mathieu Buscatto are credited as narrators, both appearing in voice roles. No writers are listed in the supplied credits.

• Coline Kahr-Aunis as Self – Narrator (voice)
• Mathieu Buscatto as Self – Narrator (voice)

Release and production context

Jellyfish, The New Rulers of the Ocean is a 2026 documentary from France with a runtime of 44 minutes. Its release date is September 10, 2026. The listed spoken languages are English, French and German. The production companies are Screenshot Productions and ARTE GEIE.

Production companies: Screenshot Productions, ARTE GEIE

Jellyfish, The new Rulers of the Ocean official trailer

Watch the official trailer on YouTube

Movies Dock view

Jellyfish, The New Rulers of the Ocean offers a compact examination of one of the ocean’s oldest forms of life and its increasingly visible impact on modern marine environments. Its combination of biology, geography and environmental questions makes it a focused documentary for viewers interested in jellyfish, ocean change and wildlife science.

Film data:
TMDB · IMDb