If you aren't all Beatles-ed (we're going to run with it) out at this stage then you'll probably want to tune back in for Tina In The Sky With Diamonds, the second and final installment in Glee's err, tribute to the fab four. Demi Lovato makes her debut as Rachel and Santana take jobs at a Broadway diner to try and make ends meet. Meanwhile, Tina receives an unexpected nomination for prom queen, which results in an attitude change that alienates her biggest supporters.