Finn challenges the glee club to find their inner powerhouses for "Diva Week." Meanwhile, in New York, Kurt can no longer take Rachel's arrogant attitude and calls her out, causing tension between the two friends. Also, Emma is in a whirlwind preparing for her upcoming wedding.

As everyone recovers from Will and Emma's wedding, the glee club is given the assignment to sing their favorite song from a movie. Meanwhile in New York, Santana makes herself at home in the loft a little too quickly for Rachel and Kurt's comfort. Also, the members of New Directions sing the hit series' landmark 500th musical performance.