In 1985, INTV Corporation introduced the "INTV System III", also branded as the "Intellivision Super Pro System", using the same design as the original Intellivision model but in black and silver. That same year INTV Corp introduced two new games that were completed at Mattel but not released: "Thunder Castle" and "World Championship Baseball". With their early success INTV Corp decided to produce new games and in 1986 introduced "Super Pro Football", an update of Mattel "NFL Football". INTV Corp continued a relationship that Mattel had with Data East and produced all new titles such as "Commando" in 1987 and "Body Slam Wrestling" in 1988. Also in 1987, INTV Corp released "Dig Dug", purchased from Atari where the game was completed but not released in 1984. They also got into producing next generation games with the production of "Monster Truck Rally" for Nintendo Entertainment System (NES) in 1991, also released as "Stadium Mud Buggies" for Intellivision in 1989.