Popsugar Entertainment Halloween Superhero Halloween Costumes Will You Be a Superhero or Villain This Halloween? September 28, 2016 by Shannon Vestal Robson View On One Page Photo 9 of 99 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Groot From Guardians of the Galaxy What to wear: A body- and head-covering tree costume. Time to get creative with the DIYs. How to act: Lumber around and only say one thing: "I am Groot." Previous Next Start Slideshow HalloweenHalloween CostumesPop Culture Halloween CostumesMovies