‘Glee’ finale: The campy spectacle that had us singing, clapping and rushing to iTunes concludes its buzz-laden freshman season. The finale has Will (Matthew Morrison) and his crew of scrappy crooners taking on their arch rivals, Vocal Adrenaline, in the regional finals. Of course, Sue (Jane Lynch) is up to no good as she again tries to ruin the glee club’s chances. Meanwhile, Quinn (Dianna Agron) experiences a life-changing event. Olivia New-John and Josh Groban have cameos as themselves. 9 p.m. Tuesday, Fox.