Captain Spoor is a Yolkian who appears prominently in the novelization of the Jimmy Neutron: Boy Genius film, but was ultimately cut from the movie itself. He is in charge of their expedition to the solar system and, in the novelization, is the one who receives Jimmy's message.

A brief clip and audio of Spoor watching Jimmy's message can be seen in the theatrical trailer. In the finished film, that scene is changed so that King Goobot directly sees the message himself.

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