Popsugar Entertainment Halloween Marvel Halloween Costumes 50+ Ways You Can Channel Your Favorite Marvel Superhero (or Villain!) This Halloween October 27, 2017 by Kelsie Gibson View On One Page Photo 21 of 55 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 21 Groot 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 CostumesGroup Halloween CostumesPop Culture Halloween CostumesMoviesMarvel