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

In this very short TV trailer, Tony Stark (Robert Downey Jr.) says to a very dapper-looking Steve Rogers (Chris Evans), "We're trying to pull off something damn near impossible and to not die trying would be nice."

In this Avengers: Endgame TV spot, Natasha Romanoff/Black Widow (Scarlett Johansson) says, "We've found something." Fingers crossed that "something" helps in their pending last battle with Thanos. The trailer also shows War Machine and Rocket running and falling to the ground. Uh-oh.