When a villainous bandit terrorizes her small Mexican village, a real-life damsel in distress enlists the help of three goofy singing cowboy Hollywood stars--mistakenly believing that they are as heroic in person as they are onscreen. The wimpy actors think they are going south of the border to perform a one-time show for a large fee. As they arrive in the tiny oppressed village, they begin to realize that they are caught in a horrible case of mistaken identity and must truly fight for their lives against the evil marauder El Guapo. They cowardly run for their lives while the village is almost destroyed until they realize the importance of their mission and are forced to use real cunning and bravery to try to defeat the villain's hordes in order to prove that the Three Amigos are as truly as courageous and heroic as they appeared onscreen.