Jim Gray returns for his seventh season as the host of Westwood One's Monday Night Football pre-game and halftime shows.   In addition to fulfilling the same role for the Network's Super Bowl broadcasts for the past six years, Gray covers boxing for Showtime, is a contributor to NBC's "Today Show" and a courtside reporter for the NBA on ESPN.   Gray's credits include: 6 Olympic Games, Major League Baseball, 11 Super Bowls, 7 World Series and 15 NBA Finals.   Gray has won eight Emmy Awards and was awarded a star on the Hollywood Walk of Fame.