Puffer fish

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Puffer fish
A puffer fish displays its "perfect defence". (TV: Listen [+]Loading...["Listen (TV story)"])
You may be looking for the humanoid Blowfish.

A puffer fish, or blowfish, was a type of fish which the Twelfth Doctor observed as an example of "perfect defence". It had the ability to increase its size and protect itself from predators with spike-like spines. (TV: Listen [+]Loading...["Listen (TV story)"])

Puffer fish naturally produced a venom called tetrodotoxin. (PROSE: Cat's Cradle: Warhead [+]Loading...["Cat's Cradle: Warhead (novel)"]) Gilles Lemaitre captured puffer fish for the tetrodotoxin he needed to create zombies. (PROSE: White Darkness [+]Loading...["White Darkness (novel)"]) The Sixth Doctor compared the Mykosians to puffer fish in that both produced substances which could control the minds of others. (PROSE: Mardi Gras Massacre [+]Loading...["Mardi Gras Massacre (short story)"])

The Eighth Doctor speculated that Jack Dupre would serve poisonous Japanese pufferfish for refreshments. (PROSE: The City of the Dead [+]Loading...["The City of the Dead (novel)"])

The London Zoo kept puffer fish in their aquarium. (PROSE: Stanley [+]Loading...["Stanley (short story)"])