Deadly Shadow of the Setting Sun - S1.E14

The American government hires Golgo 13 to eliminate a Syndicate-established hideout where poisons from various animals are weaponized by the CIA. However, another assassin named AX-3 is also hired out to do the same thing Golgo was suppose to do. AX-3 is eventually killed when his handler informs him of his orders to eliminate Golgo 13.