In "Costume Quest," four friends use their vivid imaginations to unlock the magical powers of their homemade costumes and save the universe from ferocious monsters that come alive on Halloween night. Wren, Reynold, Everett, and Lucy transform into robots, pirates, ghosts, and ice cream cones to battle the gruesome creatures and protect their town of Auburn Hollow. With their imagination as their weapon, they must work together to conquer the dark forces and ensure a spooky and fun Halloween celebration.

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Some TV shows that have similar genres and were produced around the same time as Costume Quest include Just Add Magic: Mystery City, Wishenpoof!, Marvel's Rocket & Groot, The Ghost and Molly McGee, Transformers: Rescue Bots, Baymax!.