Trapped in a flooding void, Momo, Okarun, and Aira battle the Serpo and their crab-headed enforcer until the aliens fuse with Nessie into a single monstrous creature, forcing the trio to outwit it underwater before they escape exposed in the school hallway.
Summary
Key Events
The crab-headed alien is dosed with a serum into a mantis-shrimp-like form, hammering the pair with shockwave punches. The void floods and Nessie, the snake creature, swims overhead and kills a Serpo. Okarun's curse fails him in water, so Momo improvises, turning him into a living speedboat to reach and revive a drowning Aira. A Serpo uses its cables to fuse the enhanced crab alien with Nessie, producing the Serpo Dover Demon Nessie.
Notes
Momo deduces the fused monster's mantis-shrimp arms cannot withstand force out of water, so she lowers the water to tear them apart. When it lunges to bisect her, Aira's hair snares its neck and Okarun rides that hair to split the creature while catching Momo. The three exit the void only to land in the school hallway in their underwear and flee in a panic. Adapts Chapter 21 through Chapter 25 in the Serpo Arc.
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Frequently Asked Questions
What happened to Nessie in Dandadan?
In Episode 9, Nessie is the snake creature that swims overhead in the flooding void and kills a Serpo. A Serpo then uses its cables to fuse the enhanced crab alien with Nessie, producing the Serpo Dover Demon Nessie.
What are the powers of the Serpo in Dandadan?
In Episode 9, the Serpo trap the trio in a flooding void space, dose the crab-headed alien with a serum to give it a mantis-shrimp form, and use cables to fuse creatures together. Their combination of the crab alien and Nessie creates a fused beast.
What is the Serpo Dover Demon Nessie in Dandadan?
The Serpo Dover Demon Nessie is the fused monster created in Episode 9 by cabling the serum-enhanced crab alien to Nessie. Its mantis-shrimp arms cannot withstand force out of water, which becomes its weakness.
How is the fused monster defeated in Dandadan Episode 9?
In Episode 9, Momo deduces the fused monster's mantis-shrimp arms cannot withstand force out of water, so she lowers the water to tear them apart. Aira's hair then snares its neck and Okarun rides that hair to split the creature while catching Momo.
What chapters does Dandadan Episode 9 adapt?
Episode 9 adapts Chapters 21 through 25 within the Serpo Arc. It ends with the trio escaping the void only to land in the school hallway in their underwear and flee in a panic.
Sources & Information
Looking for more on Merge! Serpo Dover Demon Nessie!? The Dandadan Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the Dandadan anime series, manga, and official materials. Episode and chapter references are cited where applicable.
Character and scene imagery on this site is original artwork by Daddy Jim Headquarters, not screenshots or licensed imagery. Official cover art is used on three types of pages for editorial commentary:
- Movie pages: theatrical key visuals, credited to Science SARU and the production committee.
- Game pages: official promotional artwork, credited to the licensed publishers.
- Manga chapter pages: Jump Comics volume covers, credited to Shueisha and Yukinobu Tatsu.
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