Talos was a giant creature made of bronze that some writers say was the last survivor from the Bronze Age. It was a very strong creature that had but one weak spot on his body, the vein in his ankle. His bronze body was kept alive by an ichor contained in that single vein.
Zeus gave Talos to Europa. Talos guarded the island of Crete. According to others, Hephaestus, who gave the robot to King Minos, designed Talos.
Hephaestus' robot guarded Crete by walking around the perimeter of the island three times a day and throwing rocks and other debris at ships so that they would not land on the island.
The Argonauts encountered Talos on their way home from Libya. Medea convinced Talos that she would give him a secret potion that would make him immortal if he would let her stop on the island. Talos agreed and drank the potion and it made him fall asleep.
Medea went to him in his sleep and pulled the plug in his ankle, whereupon Talos bled to death. Other stories say that when Medea tried to land on the island, Talos scraped his ankle on a rock while trying to fight her off and bled to death.
According to an entirely different version, Talos was killed by an Argonaut Poeas, who shot him in the ankle with an arrow.