"Heart" (stylized as "♥" in Fox's video preview materials) is the thirteenth episode of the third season of the American musical television series Glee, and the fifty-seventh overall. Written by Ali Adler and directed by co-creator Brad Falchuk, the episode aired on Fox in the United States on February 14, 2012, and features Valentine's Day love songs performed by the McKinley High glee club. It also features the debuts of special guest stars Jeff Goldblum and Brian Stokes Mitchell as Rachel's two fathers and The Glee Project winner Samuel Larsen as transfer student Joe Hart.

Whitney Houston's version of Dolly Parton's "I Will Always Love You" is performed by Mercedes (Amber Riley) in the episode, and the completed episode had been delivered to the network and was scheduled to run in three days when Houston died unexpectedly on February 11, 2012; a dedication to her was added in the episode's end credits. Reviewers gave Riley's rendition a very positive reception, the best of those given to the ten songs that were heard in the episode, though the performances in general were well received. It was one of two songs from the episode to chart on the Billboard Hot 100 and the Canadian Hot 100, along with "Stereo Hearts", while the other six singles did not chart.

Reviews of the episode varied widely, but there was more positive reaction than not. The greatest enthusiasm was for Rachel's fathers, though Principal Figgins (Iqbal Theba) was complimented on his brief scenes, and the scene with Kurt (Chris Colfer) and Karofsky (Max Adler) was also praised. The episode was also significant because it featured an on-screen kiss by Santana (Naya Rivera) and Brittany (Heather Morris), which was the show's first lesbian kiss.

Upon its initial airing, this episode was viewed by 6.99 million American viewers and received a 2.8/8 Nielsen rating/share in the 18–49 demographic, the lowest rating of the third season to date. The total viewership was down over 11% from the previous episode, "The Spanish Teacher".

Plot Will (Matthew Morrison) assigns the members of New Directions to perform the best love songs for Valentine's Day. Sugar (Vanessa Lengies) takes the opportunity to announce a Valentine's Day party, for which everyone must have a date, including herself. Artie (Kevin McHale) and Rory (Damian McGinty) both set out to woo Sugar with gifts, and she vacillates between them, so they move to song: Artie sings "Let Me Love You" and Rory, after he says he has been informed that his visa for a second year at McKinley has been denied, performs "Home". Sugar chooses Rory as her date.

Santana (Naya Rivera) and Brittany (Heather Morris) are about to kiss in the hall when Principal Figgins (Iqbal Theba) stops them. He tells them that he has received complaints about their public displays of affection, which Santana decries as a double standard, citing the much longer public kisses of Finn (Cory Monteith) and Rachel (Lea Michele).

Quinn (Dianna Agron), Mercedes (Amber Riley) and Sam (Chord Overstreet) are members of a Christian club called the God Squad and decide to raise money by performing singing telegrams for Valentine's Day; their newest member is the previously home-schooled Joe Hart (Samuel Larsen), who is now a junior at McKinley. The group serenades Rachel with "Stereo Hearts" at Finn's behest. Santana then hires them to sing for Brittany, which sparks a discussion among squad members on the morality of homosexuality; Joe must decide whether he is comfortable delivering a singing telegram for a gay couple.

Mercedes breaks up with Shane (LaMarcus Tinker), but she will not date Sam because she feels guilty for hurting Shane and wants to be sure of her own feelings. She performs "I Will Always Love You" as her song, and Sam leaves in tears.

Finn and Rachel reveal their marriage plans to New Directions, most of whom are less than enthused. Rachel's two fathers Hiram and LeRoy Berry (Jeff Goldblum and Brian Stokes Mitchell), along with Finn's mother Carole (Romy Rosemont) and his step-father Burt Hummel (Mike O'Malley), act very supportive and arrange for the couple to spend the night together in Rachel's room, expecting that the reality of having to live together will encourage the teens to postpone their wedding. The ruse backfires, and the engaged pair announce that they will be getting married even sooner than planned.

Kurt has been receiving valentines and gifts all week from a secret admirer that he believes to be Blaine (Darren Criss), who is still home recovering from eye surgery. He arrives at Sugar's party early to discover his admirer is actually former bully Karofsky (Max Adler), who declares his love for Kurt. Kurt lets him down gently, but their parting words are overheard by a classmate of Karofsky's, and Karofsky flees.

Once the party is underway, the God Squad delivers their singing telegram, a "Cherish / Cherish" mash-up, to Brittany on Santana's behalf, and the couple kisses. Sugar and Rory dance, but he is confused by her saying that she will miss him when he has to leave. Blaine arrives, having finally recovered, to lead the group in singing "Love Shack".

Production "Heart" is the second episode to be written by co-executive producer Ali Adler, and it was directed by co-creator Brad Falchuk. It commenced filming on January 13, 2012, the same day that the eleventh episode, the Michael Jackson tribute episode, completed its final musical number, and while the twelfth episode was being filmed, which had begun on January 5, 2012. The episode completed its filming with two musical numbers on January 31, 2012.

On December 8, 2011, it was reported that the show had begun casting Rachel's two fathers. It was not until January 17, 2012, that the actors playing Hiram and LeRoy Berry were identified as Jeff Goldblum and Brian Stokes Mitchell, respectively. Two days later they were on the set, shooting their first scenes with Lea Michele, who tweeted a picture of the three of them.

The appearance was long in coming, and Goldblum and Stokes Mitchell were not the first actors cast in those roles, though they are the first to appear on screen. A scene had been written in 2009 for the second episode, "Showmance", that featured Rachel's fathers, but it was subsequently cut from the script even though the actors had already been cast and reported for work. Shortly before the final nine episodes of the first season were to begin airing, co-creator Ryan Murphy, when asked at PaleyFest in March 2010 whether her fathers would be appearing, replied: "Not this season. We've never met them; I think that's a great surprise. I think you want to hold that a little bit." Between the second and third seasons, co-creator Ian Brennan said, "It's tricky with parents", referenced the scene cut from "Showmance", and noted, "we've talked about it forever, about different sets of parents", but "when you're in high school, your parents stop being the major influence in your life". He then added, "I think soon we'll probably reveal more and more".

The second of the two winners of The Glee Project seven-episode arc, Samuel Larsen, debuts in this episode as a new transfer student to McKinley named Joe Hart. Larsen had arrived on the set by January 17, 2012, according to Cory Monteith, who described Larsen's role as one that "ties into a lot of preexisting storylines", and "a smart way to bring him into the show". Larsen's first day of filming with the glee club was January 25, 2012, and a number of his fellow actors tweeted of his arrival, including Lea Michele, Dianna Agron, and fellow Glee Project winner Damian McGinty.

Although it was originally thought that Darren Criss would be missing "one and a half episodes", and therefore might return in time to appear in this episode after missing the twelfth one, co-star Chris Colfer initially stated that Criss would not be appearing: "You'll find out how [Blaine] leaves for a little bit and then comes back, but it’s nothing too bad or serious". He later said that Blaine "is in the episode, it's not in the way you might think"; Criss did return in time to appear in the musical finale. Recurring guest stars who are appearing in the episode include glee club members Sam Evans (Overstreet), Rory Flanagan (McGinty) and Sugar Motta (Lengies), Principal Figgins (Theba), Finn's mother Carole Hudson-Hummel (Rosemont) and stepfather Burt Hummel (O'Malley), former McKinley student Dave Karofsky (Adler) and McKinley football player Shane Tinsley (Tinker).

The episode features cover versions of ten songs, nine of which have been released as eight singles available for downloading, with the two-song mash-up released as one single, but no release of "Chapel of Love", which was heard in only a brief snippet on the show. Performances include Nat King Cole's "L-O-V-E" sung by Jenna Ushkowitz and Harry Shum, Jr.; Dolly Parton's "I Will Always Love You" in the style of the Whitney Houston cover version sung by Riley; "Stereo Hearts" by Gym Class Heroes featuring Adam Levine sung by Larsen, Overstreet, Agron and Riley; and Mario's "Let Me Love You" sung by McHale. Other songs that are featured include Cole Porter's "You're the Top" from the musical Anything Goes, "Love Shack" by The B-52's, Michael Bublé's "Home", and a mash-up of two songs entitled "Cherish": The Association song and the Madonna song. Whitney Houston died unexpectedly on February 11, 2012, three days before the episode was scheduled to air and the day after the finished episode was delivered to the network. The producers subsequently announced that they would pay tribute to Houston with a dedication to her in the end credits.

Reception

Ratings "Heart" was first broadcast on February 14, 2012, in the United States on Fox. It received a 2.8/8 Nielsen rating/share in the 18–49 demographic, and attracted 6.99 million American viewers during its initial airing, a significant decrease from the 3.3/9 rating/share and 7.81 million viewers of the previous episode, which was broadcast on February 7, 2012, and the lowest rating of the third season to date. In Canada, however, viewership increased, and 1.72 million viewers watched the episode on the same day as its American premiere. It was the thirteenth most-viewed show of the week, up two slots and over 9% from the 1.57 million viewers who watched "The Spanish Teacher" the previous week.Canadian viewership data: "Heart": "The Spanish Teacher":

In the United Kingdom, "Heart" first aired on March 22, 2012, and was watched on Sky 1 by 792,000 viewers. Viewership was up slightly from "The Spanish Teacher", which attracted 771,000 viewers when it aired the week before.UK viewership data: "Heart": "The Spanish Teacher": In Australia, "Heart" was broadcast on March 9, 2012. It was watched by 563,000 viewers, which made Glee the fourteenth most-watched program of the night, down from twelfth the week before. Despite the drop, actual viewership was almost unchanged from the previous episode, "The Spanish Teacher", which was seen by 564,000 viewers.Australian viewership data: "Heart": "The Spanish Teacher":

Critical reception