Will insists that Rachel must have a co-captain, so after a string of rejections, she appeals to Finn's sense of leadership, who agrees. After a pre-emptive football hazing as the new co-face of glee club, Finn backs out, leaving Rachel to pose all by her lonesome. Sadness.
But, during her photo shoot, Rachel finds out the yearbook photographer is casting for a mattress store commercial in town. She signs up all the glee clubbers, who are strangely enthusiastic about this opportunity at local stardom. Mind you, I would have been much more embarrassed to appear in a hokey local ad than in my high school yearbook, but I don't know the rules of McKinley High.
So, the kids perform an awesome cover of "Jump" and bounce around on mattresses for the local warehouse. As a thank you, they're given a pile of mattresses that sit in the choir room.
Will, having no idea that the commercial shooting took place, stumbles upon Terri's fake pregnancy belly and puts two and two together. He confronts her, then storms out. Luckily, there's a pile of mattresses right by his office! Hooray! He breaks one open and sleeps on it.
Sue, while performing her segment on local TV news, sees the mattress commercial and realizes that it disqualifies the New Directions from performing in sectionals. She really knows that rule manual, as any activity resulting in payment immediately disqualifies any school from the amateur competitions. Unfortunately, since Will opened one of the mattresses given to the club, they can't return or donate their "payment", effectively ending glee club (since the original deal was that they had to place at sectionals in order to continue - remember?).
BUT, miraculously, it's Quinn to the rescue! She's desperate to get back on Cheerios and into the cheerleading yearbook photo, so she blackmails Sue into letting the glee club compete at sectionals and have a full page spread in the yearbook. It seems that the girls in Cheerios are showered with complimentary swag, which they sell on eBay for a profit, and if Principal Figgins knew, they'd be banned from competing as well. Sue compliments Quinn's ruthlessness, and sends her away.
Will figures out that if he recuses himself from glee club competition, the team will be intact and able to go to sectionals. He is sad, of course, but the show will go on for New Directions. At the end of the episode, we learn that all the efforts of the club has been in vain, as the football losers still deface their photo in the yearbook. Womp, womp.
So, Will's out of glee club - again. He's also out of his marriage, potentially, which will create an interesting decision for Emma (who's back - hooray!), about to impend on her own disappointing union. Will she decide to hold out for the newly-single (maybe?) Will? The most devastating scene of the episode was by far when Will discovered Terri's treachery, a moment of unanticipated gravity in the usually light hearted series. He was both heartbroken and infuriated, which isn't an easy combo. More evidence that Will is more than a pretty face. Does this mean the end of Terri? No more ruthlessly screwing up Will's life? Maybe. But wouldn't it be perfect if Terri got for-reals pregnant right now, and Will didn't believe her? I smell impending irony!