Tanystropheus

The Cave Serpent is a giant serpent kaiju that appears in the 1933 film, King Kong.

History
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.