You'd think all the weirdness would give Eerie a rest at least once a year: maybe on Halloween? But no. Mitchell's dad is planning a special Halloween show on radio station WERD -- a spooky story about invaders from Mars. Then MItchell and Stanley find some cool stuff to wear at the local costume shop, and offer to help the owner organize a Halloween parade in return. Little do they know that they're about to get caught up in the weirdest adventure of all. Because some of the people in Eerie aren't really people -- and Dad's Halloween radio show might just turn out to be true!
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