Elasmosaurus is a plesiosaur with a long neck. The depiction of Elasmosaurus in King Kong, possessing an elongated tail significantly longer than its neck, resembles the 'head on the wrong end' version of the creature, a depiction first popularised in 1869 that was later proven to be inaccurate.
When King Kong brought Ann Darrow to his mountain lair, he was suddenly attacked by the cave serpent. Kong set Ann down and struggled with the serpent. The creature wrapped its long body around Kong's neck and attempted to strangle him. Kong pulled the serpent off with all his might and slammed it onto the rocky surface of the cave, snapping its spine and killing it.
- Main article: Elasmosaurus/Gallery.
- The Elasmosaurus may have inspired the other giant serpent-like kaiju that King Kong fought in later films, such as the Giant Sea Serpent from King Kong Escapes and the giant boa from the 1976 remake of King Kong.
- An Elasmosaurus was to appear in Peter Jackson's un-filmed 1996 version of King Kong. It would have emerged from a lake near Kong's cave and killed a cowardly Venture crew member named Peek before being attacked itself by a flock of Bat-Things as Ann Darrow and Jack Driscoll made their escape. Unlike its original film counterpart, this Elasmosaurus never would have interacted with Kong.
- In the video game adaptation of the 2005 film, during one level Kong must battle two giant serpent-like monsters in a cave. This level is most likely a tribute to Kong's battle with the cave serpent, as the way Kong kills the serpents is by slamming them onto the ground, the same way he killed the cave serpent.
- The Dragon from the 1987 Toho film Princess from the Moon is sometimes labeled as an Elasmosaurus in official publications.
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