The term 'Thunder Predecessors' refers to the Seattle SuperSonics, a professional basketball team that played in the National Basketball Association (NBA) from 1967 to 2008. The team was based in Seattle, Washington and was originally known as the Seattle SuperSonics. The team relocated to Oklahoma City in 2008 and became the Oklahoma City Thunder. The Sonics were one of the most successful teams in the NBA during their time in Seattle, winning the 1979 NBA Championship and making the NBA Finals three times.