Breaking bad

A man in a green shirt holds a gun directly at the camera in a desert landscape, then the scene cuts to three men standing on a road at sunset, followed by a man walking toward the camera in front of a building with smoke rising behind him, then a man in a yellow hazmat suit appears with a chemical symbol and his name, then a man in a black jacket walks toward the camera in an urban area, and finally a man in a trench coat stands in a dimly lit room facing another man.