Season five of NBC's Grimm returns to the small screen just in time for Halloween this Friday! We already got a glimpse at the cast living it up during a Montana getaway in September, and now we're taking a look back at some of their best Halloween costumes. Scroll through to see the impressive outfits, and then make sure to check out more than 250 celebrity Halloween costume ideas to help you figure out what to wear on the big night.
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