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A wealthy Japanese executive who offers Cobb a job that deals with inception in return promising to allow Cobb to return home. He later tags along with the rest of the team as is known as "the tourist".
Saito is the head of Proclus Global, a major energy company, which Cobel Engineering hired Cobb, Arthur and Nash to steal the company's expantion plan from Saito's mind using extraction. After they fail to do so, Saito finds Nash who sells the team out by telling him where Cobb and Arthur are. More intrigued than angry, Saito asks about them inception (Cobb being the only one certain it's possible) and asks them to help him with a intricate job that involves convincing the son, Robert Fischer, of a rival and terminally ill business owner, Maurice Fischer, to divide his father's empire after he passes. Cobb is reluctant until Saito strikes a deal to drop his charges against murdering his wife Mal, which Saito (being very wealthy) has the power to do.
Saito returns to Cobb in Mombassa as he is recruiting Eames and Yusef in order to "protect his investment" and joins the team every step of the way even into the dreams. Also due to his tremendous wealth, Saito is able buy out the airline that Fischer will take to Los Angeles for his father's funeral, which (while on board) is where they plan to conduct the inception.