What famous Greek hero fought andkilled nine needed hydra?

The famous Greek hero who fought and killed the nine-headed Hydra is Hercules (Heracles in Greek mythology). As part of his Twelve Labors, he was tasked with defeating the Hydra, a monstrous serpent-like creature that could regenerate two heads for each one that was cut off. Hercules ultimately succeeded by using fire to cauterize the necks after decapitating the heads, preventing them from regrowing. This labor showcased his strength, ingenuity, and determination.