Captain America and the Avengers is a coin-op arcade game released by Data East in 1991. It features the Marvel Comics characters The Avengers.
The NES version is a side-scrolling action platform game. The only playable characters in this version are Captain America and Hawkeye; their mission is to save the Vision and Iron Man from Mandarin.
Source: Wikipedia, "Captain America and the Avengers", available under the CC-BY-SA License.