The series aired on The WB Network for five seasons, then moved to UPN for its last two seasons. It was the first series in television history to change networks between seasons without being cancelled and then picked up by a different network. Though "Buffy" first aired on Mondays at 9pm, from the middle of the second season it ran on Tuesdays at 8pm. In the musical episode, Buffy makes the comment, "Dawn's in trouble. Must be Tuesday."