Eugene Edward "Mercury" Morris (born January 5, 1947), is a former American football running back and kick returner. He played for seven years, primarily for the Miami Dolphins in the American Football League (AFL), then in the American Football Conference following the 1969 merger with the National Football League (NFL).
Morris played in three Super Bowls and was selected to three Pro Bowls. In 1982, Morris was convicted of felony drug trafficking charges. After three and one-half years in prison, Morris was released after a plea agreement in which he pleaded no contest to cocaine conspiracy charges.
Mercury was nicknamed early on in his career for his quickness when running with the ball.