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Pay It Forward is a multi-level marketing scheme of the heart. Beginning as a seventh-grade class assignment to put into action an idea that could change the world, young Trevor McKinney (Haley Joel Osment) comes up with a plan to do good deeds for three people who then by way of payment each must do good turns for three other people. These nine people also must pay it forward and so on, ad infinitum. If successful, the resulting network of do-gooders ought to comprise the entire world. Trevor's attempts to get the ball rolling include befriending a junkie (James Caviezel) and trying to set up his recovering-alcoholic mother (Helen Hunt) with his burn-victim teacher (Kevin Spacey), who posed the assignment.