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b'When a surprise guest visits H.G. Wells Middle School in advance of the all-important GFT test, the exhilaration of Mars and his friends turns to horror as Mars starts a fight he may not be able to finish.\\nThis Peabody Award-winning serial mystery is beloved by families and classrooms all over the world. For more great shows, visit GZMshows.com.\\nLearn more about your ad choices. Visit megaphone.fm/adchoices'