Box-office preview: ‘Guardians’ set to rocket to top of ticket sales

Launching in 4,080 theaters—a record for the month of August—Marvel’s 3-D sci-fi flick "Guardians of the Galaxy" stars Chris Pratt, Zoe Saldana, Dave Bautista, Vin Diesel and Bradley Cooper as a ragtag crew of space outlaws protecting the universe from evil forces that would destroy planets...