Ep. 4: Presidente tem Sonic como alvo após descoberta do Chaos Emerald na escola de Chris

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From the previous incident, the President becomes aware of Sonic's existence and views Eggman's scientific power as a threat. Afterwards, an agent (Mr. Stewart) is sent into Chris' school to pose as a teacher. It is then reported that a mysterious stone that causes a machine to malfunction has been discovered. Eggman and Sonic's group arrive at the scene and get in a struggle, knowing that the stone is a (green) Chaos Emerald. Soon after, Chris obtains the Chaos Emerald, but ends up falling from a high place, with Sonic rescuing him in the nick of time. (Source: Wikipedia)