https://www.cnet.com/news/all-avengers-endgame-trailers-and-posters-so-far-in-one-place/

In this TV spot, we see Captain America (Chris Evans) give one heck of an Avengers pep talk to the team about the daunting tasks ahead: "You know your teams, you know your missions." 

But he also reminds the gang there's no room for mistakes when fighting Thanos, as they won't get a do-over on this one. "This is the fight of our lives."