James Gunn's "Guardians of the Galaxy" films (as well as the accompanying "Holiday Special") have greatly expanded the narrative possibilities of the Marvel Cinematic Universe. Audiences have been treated to countless characters, creatures, and worlds, all of which have been delivered with Gunn's signature combination of imagination and wit. Of course, as wild and fresh as the cosmic elements of the MCU are, there's been no shortage of heart. Gunn was given the unenviable task of making us...