The rumor mill's been predicting this since the summer, but now Marvel has officially welcomed Vin Diesel to the family. The Fast & Furious star is, as he's been hinting, a part of this summer's Guardians of the Galaxy, where he'll voice Groot, the extraterrestrial warrior plant. He joins a sprawling cast that also includes Chris Pratt, Zoe Saldana, Bradley Cooper and Benicio del Toro. Guardians hits theaters August 1. Unfortunately Marvel has still not released an official trailer or even teaser yet, so for now let this gif of Rocket Raccoon (voiced by Cooper) spraying a machine gun tide you over.