Unable to play video. Although Guardians of the Galaxy Vol. 3 doesn't seem to be the top priority for Marvel at the moment, it looks like the film's production has already been given a working title. According to a new listing from Production Weekly, the third installment of the Guardians of the Galaxy franchise is listed under the working title of Hot Christmas. But who knows, maybe the final movie of the trilogy, which was written by James Gunn, actually takes place around the holidays.