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The Episode:Sue Sylvester (Jane Lynch), the coach of the McKinley High School cheerleading squad, grows disillusioned with the sport, and in an effort to recapture her love for it, plans to fire Brittany from a cannon during the team's next competitive routine. Meanwhile, football coach Shannon Beiste (Dot-Marie Jones) has the school football players join the glee club, New Directions, in order to dispel rivalry between the students. In revenge for opposition to her cannon plan, Sue has the cheerleading Regionals competition moved to the same night as a football championship game, so her cheerleaders will be unavailable for the halftime show, and forces the affected squad members to resign from the glee club. New Directions' director Will Schuester (Matthew Morrison) announces that the club members, including the football players, will perform the halftime routine, planning a mash-up of Michael Jackson's "Thriller" with "Heads Will Roll" by the Yeah Yeah Yeahs. He notices and encourages the talent of Dave Karofsky (Max Adler), a bully who has previously acted violently towards the glee club members. When the football players are attacked by members of the school hockey team, Karofsky encourages them to quit the glee club, resulting in Beiste barring them from the championship game.
To ensure that the game goes ahead, glee club members Rachel (Lea Michele), Mercedes (Amber Riley), Tina (Jenna Ushkowitz) and Lauren (Ashley Fink) join the football team. The game begins badly for the McKinley side, and when Tina is injured during a play, captain Finn Hudson (Cory Monteith) takes control of the situation. He has club member Puck (Mark Salling) convince the former football players to return, and convinces cheerleaders Santana (Naya Rivera), Brittany (Heather Morris) and his ex-girlfriend Quinn (Dianna Agron) to quit the cheer squad and perform at the halftime show. Only Karofsky refuses to participate, but when he sees the positive reaction the crowd has to the routine, he joins in himself. Beiste welcomes the football players back, and they go on to win the game by intimidating the opposing side, dressed as zombies from the halftime routine.
Sue's cheer squad loses at Regionals for the first time in seven years, and she is named Loser of the Year in a televised interview with Katie Couric. Furthering her ire, the cheerleading budget is slashed due to the cannon being seen as endangering the lives of children. The money is then handed over to the glee club so they can pay to go to regionals. Karofsky dismisses Finn's suggestion that he join the glee club permanently. Finally, Quinn kisses Finn, telling him that his actions have reminded her of why she loved him.
The Song: "Thiller" is the spooky horror-film themed seventh single, and title track from Michael Jackson's sixth studio album, Thiller. It went on to become one of his most popular and signature songs. The film clip, at a running time of fourteen minutes is substantially longer than the studio version of the song. Both the film clip, which is heavily inspired by 1950's horror movies, and the 'zombie dance' from the film clip have been heavily references in pop culture, movies and tv shows.
"Heads Will Roll" is the similarly themed song from the Yeah Yeah Yeah's, and features as the second single from their third abum, titled It's Blitz!. The music video for "Heads Will Roll" was directed by Richard Ayoade. It features the band playing in a – presumably – underground venue when a dancing werewolf (whose dancing is reminiscent of Michael Jackson's) appears on stage. A light flashes halfway through the music video and the werewolf transforms. He then proceeds to chase after the audience and kills most of them. The video then ends with the band having been murdered while Karen O continues singing, her head severed from her body. The music video contains some mockery of horror in general; instead of blood there is glitter and confetti and Karen O keeps singing with her head separated from her body.
Source: Wikipedia