Captain America, Vol. 3 American Nightmare, Chapter Two: The Growing Darkness (Issue #10A, 1998) by Marvel Comics features Captain America dealing with the villain Nightmare. In this storyline, Nightmare, the lord of dreams, poses a significant threat. Captain America, with the help of Sharon Carter and other allies, faces various challenges and adversaries, including Rhino and U.S. Agent, who are manipulated by Nightmare.