Terror Tales of the Park 2 is another halloween speail.The 3rd episode in season 4.Mordecai and Rigby tells scary tales whine driving to a halloween party.In season 4 promo,there some reviews about Terror Tales of the Park 2.the first halloween speail is Terror Tales of the Park.The episode airs on Oct. 15th 2012. Terror Tales of the park 2 is another half hour episode.The first one is Terror Tales of the park,the 2nd one is Exit 9b.
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More info:link