Things heat up as the New Directions go head-to-head with the Dalton Academy Warblers at Regionals.

Rachel and Kurt pay a visit to Lima as the glee club launches its production of "Grease". Meanwhile, Cassandra July returns to shake things up in Rachel's life, and Santana comes back to lend a helping hand.

Blaine and Sue will have a sing-off, while Ryder has a scary story coming.

The New Directions pay homage to the Piano Man: Billy Joel. As graduation looms closer, the seniors make plans for their futures beyond the halls of McKinley.