Agent Smith (later merely "Smith") is a fictional character featured in The Matrix film series and multimedia franchise, mainly played by actor Hugo Weaving and briefly by actor Ian Bliss in the films and voiced by Christopher Corey Smith in The Matrix: Path of Neo. The struggle between Neo and Smith becomes the main conflict underlying the events of The Matrix, which makes Smith the main antagonist of the series.
In 2008, Agent Smith was selected by Empire Magazine as one of The 100 Greatest Movie Characters of All Time.
Smith began as an Agent, an AI program in the Matrix programmed to keep order within the system by terminating human avatar which would bring instability to the simulated reality, as well as any rogue programs that no longer serve a purpose to the Machine collective. To this end, Smith possesses the ability to take control over the simulated body of any human wired into the Matrix. As an Agent, Smith is able to bend the rules of the Matrix (such as gravity and the limitations of the human body), giving him speed and strength beyond ordinary human capability. He and other Agents can dodge bullets flawlessly, punch through concrete with their bare hands, and jump impossible distances. Agents also have the ability to communicate with each other instantaneously and perceive what other humans wired into the Matrix do via a type of shared consciousness, represented via their earpieces (when Agent Smith removes his earpiece during the first film, he is left unaware of the attack on his building). Smith's weapon of choice in the first film, as is standard with all Agents within the Matrix, is the Desert Eagle, chambered for high-caliber .50 AE ammunition.
At the end of the first Matrix film, Smith is deleted by Neo; however, in the sequels, Smith is revealed to have been "freed" from the Machines' control, preventing him from being forcibly sent to the system source where he and other programs would be deleted. This process makes him into a renegade program, effectively making him a self-replicating computer virus. Along with his freedom, Smith gains the ability to copy himself onto others within the Matrix, rather than simply having the ability to switch between bodies as normal agents are able to. By copying himself into a human in the process of disconnecting from the Matrix by making use of the in-Matrix landline, Smith is able to insert himself into the outside world. This is seen when Smith takes over Bane's body in The Matrix Reloaded. Smith's real power comes from his ability to absorb memories and power from his victims, culminating in his form that fights Neo in the final battle of the Matrix series. Smith goes so far as to copy himself into the Oracle and he even tries to control Morpheus, and Neo himself.
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Official Site: Warner Bros.
Links: Wikipedia: Agent Smith Agent Smith Quotes Warner Bros. Official Matrix Site