Will encourages the Glee Club to support Artie, and asks each of them to perform in a wheelchair. Meanwhile, Kurt and Rachel compete for a big solo.

When Kurt sets his dad, Burt, up with an unexpected partner his plan for a nuclear family may backfire. Sue demands that the Cheerios! go on a crazy diet in preparation for a big interview with “Splits” magazine and April Rhodes returns to save Will and the glee club.

Mr. Schuester starts an investigation when a salacious list about members of the glee club circulates the halls of McKinley High. Meanwhile, Sue is mortified when a video of her performing the Olivia Newton-John classic "Physical" surfaces

New Directions heads to the big Sectionals competition to go head-to-head against the Warblers and the Hipsters. While trouble brews between some of the young couples, Emma and Carl grow closer.

Will assigns the glee club a Spanish singing assignment, and enlists the help of his musically-inclined night school teacher. Meanwhile, Rachel spills the beans to Kurt and Mercedes on Finn's marriage proposal, and Mercedes has love complications of her own.

The glee club pays homage to a true icon when they cover Whitney Houston's greatest hits. Meanwhile, Emma and Will are one step closer to their dream wedding.

Finn encourages the glee-club members to channel their inner divas. Elsewhere, Rachel's arrogance causes Kurt to reach a breaking point; and Emma throws herself into wedding preparations.

When the power goes out at McKinley High, Will and Finn enlist the members of New Directions to "unplug" and perform acoustic numbers. Meanwhile, Isabelle Wright asks Kurt to volunteer at the Vogue.com charity event, with Rachel and Santana in tow.

GLEE goes back in time to see why the original members of New Directions signed up for glee club in the first place.