Marvel has debuted the first official trailer for "Guardians of the Galaxy," the upcoming sci-fi super-hero adventure starring Chris Pratt, Zoe Saldana, John C. Reilly and the voices of Bradley Cooper (as Rocket Raccoon) and Vin Diesel (as Groot, an alien tree). The James Gunn film looks like one of Marvel's funniest features to date thanks to Pratt's comic timing and a geeky sensibility that knows just how to rock Blue Swede's "Hooked on a Feeling." The second of two 2014 Marvel blockbusters, following April's "Captain America: The Winter Soldier," "Guardians of the Galaxy" arrives in theaters on Aug. 1. Watch the first trailer, via "Jimmy Kimmel Live," below.
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