Brad Ellis

The kids channel profiles pop divas Katy Perry and Lady Gaga, and whilst, in New York, Kurt and Santana hold auditions for the new band which they're starting with Rachel and Dani.

A disco inferno rages at McKinley when the New Directions pay homage to the iconic 70s movie `Saturday Night Fever'. Plus, Sue faces a battle.

Blaine tries to pull the New Directions' strings when he comes up with a plan to win Nationals. In New York, Kurt's band, Pamela Lansbury, gets its first gig which they want to be perfect.

While Sue reignites her feud with Will, she plots to bring down Rachel and the New Directions as well as reuniting Kurt and Blaine.