Guardians of the Galaxy Vol. 3 is coming to Disney+ next month. Disney+ announced in a press release yesterday that the Marvel superhero film will start streaming Aug. 2. Guardians of the Galaxy Vol. 3 is a sequel to Guardians of the Galaxy (2014) and Guardians of the Galaxy Vol. 2 (2017), which are also available on Disney+. The franchise is based on the Marvel superhero team Guardians of the Galaxy and stars Chris Pratt, Zoe Saldaña, Dave Bautista, Karen Gillan, Pom Klementieff, Vin Diesel, Bradley Cooper, Will Poulter and Sylvester Stallone.