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. Musical performances include “Greased Lightning", "Look At Me I'm Sandra Dee", "Beauty School Drop Out", "Look At Me I'm Sandra Dee Reprise", "There Are Worse Things I Can Do" and "You're The One That I Want".