Ezra Miller, who brings the character to life in the DC Extended Universe film, recently spoke about that in an interview with Total Film Magazine. Miller provided a creative analogy of how Barry feels about joining the team.
"He's [like] the 13-year-old Metallica fan," Miller explained, "and Metallica says, 'We lost our drummer in a freak accident. We need you to play drums, bro!' [And he's like] 'I don't even have drumsticks!'"
Fans have already gotten an inkling of this in Justice League's promotional material, with Barry very eager to join the team after learning that Bruce Wayne (Ben Affleck) is the Batman. They've also gotten a hint at Barry's insecurities, with him proclaiming that he doesn't quite know how to battle yet.
Nevertheless, it seems like Barry will prove his worth over the course of the film, with his incredibly fast powers a huge asset for the team.
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In Justice League, fueled by his restored faith in humanity and inspired by Superman's (Henry Cavill) selfless act, Bruce Wayne (Ben Affleck) enlists newfound ally Diana Prince to face an even greater threat. Together, Batman and Wonder Woman work quickly to recruit a team to stand against this newly awakened enemy. Despite the formation of an unprecedented league of heroes -- Batman, Wonder Woman, Aquaman, Cyborg and the Flash -- it may be too late to save the planet from an assault of catastrophic proportions.