Devious Dolphins
"Sweet and cuddly, am I?"

Never trust a species that grins all the time. It's up to something.

The trope of the Friendly, Playful Dolphin has become so well-known in recent years that it has become popular for writers of various works to subvert it by instead depicting them as cunning, sinister, and even evil animals — in essence, an Alternate Character Interpretation of them as species. This is mostly found in comedy works, much like the similar Hair-Raising Hare trope, which also relies on subverting the audiences expectations of a typically "cute" animal.

Ironically, this trope is actually closer to reality than the one it began as a subversion of, since recent research has shown that bottlenose dolphins often display behavior that would be considered sociopathic by human standards, including a tendency towards violence and recorded instances of infanticide and aggression towards other cetaceans. Chances are, though, that most of the writers using this trope were not aware of that fact.


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  • Alastair Reynolds' Chasm City uses this trope by means of Subverting Friendly, Playful Dolphin. The first of the Sky Haussman flashback episode introduces you to children Sky and Constanza who evade their parents' oversight to go visit the dolphins who are kept in the spaceship they live in. That looks very cute and slightly cliché... until you meet the dolphins, who after being used as experimental subjects by a radical transhumanist group and then kept and bred in captivity for centuries, have turned sadistic and totally psychotic.
  • The Scar: Dolphins are an intelligent race in the setting. The main dolphin character in the book, and also the head of the underwater police of the floating city of Armada, is a vicious sadist named Bastard John.

    Live-Action TV 

    Mythology & Folklore 
  • In the mythologies of many of the native peoples of the Amazon Rainforest, the Amazon River dolphins, also called the encantados, are given many characteristics reminiscent of The Fair Folk, in that while they're not generally understood as being malicious creatures, they're still treated as potentially very dangerous. They are particularly associated with kidnapping humans, stealing away people they meet on the river shore (or on dry land, as they're also said to be able to take human form), who will be taken to the dolphin's magical realm below the waters and never seen again. In some places, this has resulted in people refusing to go near the river at night or alone. Encantados are also attributed with other harmful powers, such as causing insanity and spreading disease.

    Tabletop Games 
  • Call of Cthulhu supplement Cthulhu Now, adventure "The City in the Sea". While searching for an underwater temple, the Player Characters are attacked by a group of killer dolphins under the control of a Cthulhu Mythos deity named Gloon.
  • Dungeons & Dragons: The Frostburn sourcebook includes the Malasnyep, a species of typically Chaotic Evil dolphin-like monsters native to the far north. They are viciously aggressive and will attack anything that cross their path, seemingly doing so entirely out of a compulsion to kill anything that enters their territory.

    Video Games 

    Web Comics 

    Web Original 
  • Cracked had an article on how dolphins have been observed committing rape on each other.
  • Mortasheen:
    • Dolfuries, also called the Slaughtering Cacklers, are some of the very few Always Chaotic Evil monsters. They were originally created as human-dolphin chimeras to be guard monsters for the vampires, which resulted in "combining the intelligence and cruelty of both hominid and delfinid". The result were creatures that were unspeakably sadistic, monstrously cruel, borderline sociopathic and easily bored. Their vampiric creators tried to destroy them all out of disgust, but one female escaped with her offspring and they've been plaguing the world ever since.
    • Cacchinnoxes are a kind of Joker — brightly colored, clown-like monsters who live in hives and lead lives of anarchism and destructive "humor" — resembling enormous, eyeless dolphins that move around on dry land by slithering on their lower bodies. They can also tune their squeaks to cause intense pain to their victims. Their sense of humor is cruel even by Joker standards, inevitably focusing on causing physical or emotional harm on whoever is unlucky enough to become the target of the Cacchinnox's comedy, and as a result even other Jokers are forced to keep them contained deep within their hives.
  • The YouTube series "Scientifically Accurate" portrays dolphins as tragic, but sometimes evil, in "Scienticfically Accurate Flipper".
  • The Loan Dolphin from SuperMarioLogan is a dolphin whose job is a debt collector. He wears a leather jacket and speaks in a gruff voice, but he's only an antagonist to those who don't pay their debts. In the episode, "Bowser Junior's Lemonade Stand!", when Junior hires the Loan Dolphin to destroy Cody's lemonade stand, he refuses, since he thinks it looks nice.

    Western Animation 
  • In The Penguins of Madagascar, Dr. Blowhole is a recurring antagonist. He is a dolphin with a mechanical right eye who used to work as a performing dolphin in a marine park. He wants revenge on the humans for the humiliation that lead to his path of villainy, and he refers to the Penguins as the "Pen-gyu-ins".
  • The Simpsons:
    • In "Boy-Scoutz 'n the Hood", Bart, Homer, Flanders and Flanders' kids remain stranded at sea after getting lost while rafting. They're eventually approached by a trio of dolphins. Flanders is relieved, stating that dolphins always help people lost at sea. Instead, the dolphins merely chitter to each other that the castaways are all going to die, laugh a bit, and then leave them to their fate.
    • In the "Treehouse of Horror XI" segment "Day of the Dolphin", an aquarium dolphin named Snorky leads the rest of dolphinkind to rebel against the humans, take back the land for themselves, and force humanity into the sea to die.

    Real Life 
  • It's been theorized that the stories of drowning men pushed ashore by dolphins might be biased: sure there are people who were pushed towards land, but how many were pushed away?
  • Real Life dolphins are known to be much more prone to aggression than their popular culture depictions show them as: among other things, Atlantic bottlenose dolphins have been repeatedly recorded mobbing porpoises and beating them to death. Why they do this isn't clear — they don't eat the corpses afterwards, and while competition for food was brought up as a possibility the two cetaceans don't seem to feed on the same types of fish.