The clip started off with a car chase featuring a motorcycle and a black Audi SUV. The chase involved Captain America (Chris Evans), Black Panther (Chadwick Boseman), Bucky Barnes (Sebastian Stan) and Falcon (Anthony Mackie). They pursued each other through a tunnel, which became engulfed in explosions generated by the skirmish.
Eventually, the characters emerged from the tunnel, only to be met by War Machine (Don Cheadle). It appeared as though he was on the scene to detain Captain America.
"Stand down now," War Machine angrily told the captain. "Congratulations, Cap, you’re a criminal.”
Black Panther then intervened, baring his metal claws and ripping off his mask to reveal his identity.