Ricardio the Heart Guy

Ice King has kidnapped Princess Bubblegum. Finn and Jake throw snowballs at Ice King's eyes, which stalls him enough for them to replace Princess Bubblegum with Jake's butt, which Ice King still thinks is Princess Bubblegum and kisses it. Princess Bubblegum thanks the boys by hugging Finn (making him embarrassed) and honoring them with a party. Finn makes a paper crane for Bubblegum as a gift, and Jake says that Finn has a crush on her, which he denies. But when they arrive at the party, no one notices them and only watch as a heart-shaped man gives Lumpy Space Princess a massage called the Best Friend Massage. Bubblegum walks in, and the heart-shaped man introduces himself as Ricardio. He begins talking to Princess Bubblegum about Plantoids and Zanoits and other science subjects.

Finn immediately gets jealous, and he tries to impress Bubblegum by doing the Science Dance, but embarrasses himself by saying "I'm not jealous, I'm WEIRD!" when Bubblegum accuses him of being jealous. Finn thinks Ricardio is a villain, but Jake does not, so they spy on him to see if he is evil or not. They see Ricardio going into a dumpster, holding a rope and broken bottles. Then they see him throwing the Ice King into the dumpster, so they question him about being a super-villain. Finn punches Ricardio right when Bubblegum comes. Mad and upset, she takes Ricardio away. And when Finn begins to believe Bubblegum hates him and that he was wrong, Ice King then crawls to Finn and Jake and tells them that Ricardio is a villain.

He says that during an experiment where he tried to take control of Princess Bubblegum's heart, he messed up and lost control of his. Ricardio said that he was going to cut out Princess Bubblegum's heart and make out with it. Without Ricardio, Ice King grew weak but managed to get to the Candy Kingdom and pleaded to Ricardio for him to return to Ice King's body, but instead Ricardio threw him into the dumpster and left him for dead. Finn and Jake hurry to the Princess Bubblegum's Castle and find Princess Bubblegum tied to a chair, being held hostage by Ricardio. Finn and Jake then fight Ricardio and manage to beat him up. The Ice King crawls into the castle and places Ricardio into his chest. He then believes that Bubblegum would marry him, but Finn kicks him in the face, which causes him to fly away. During dinner, Bubblegum tells Finn that he does not need to be jealous anymore, but Finn denies that he was jealous in the first place. Then, Princess Bubblegum says "Kiss me, Finn," which causes Finn to blush. Princess Bubblegum was just acting like Jake did in the beginning of the episode; she was upside-down with a picture of Jake on her dress. Finn then screams, "NOOOOO!"

The episode guest stars George Takei.

"Ricardio the Heart Guy" was written and storyboarded by Bert Youn and Sean Jimenez, from a story by Merriwether Williams, Tim McKeon, and Adam Muto. Directed by Larry Leichliter, the episode introduces the recurring villain Ricardio, played by George Takei, a character that Tom Kenny later called "the valentine from Hell".[2] Takei later reprised the role in the season four episode "Lady and Peebles".[3] Initial drafts of the character featured him looking more like an anthropomorphic heart, complete with arteries and ventricles.[4] Ricardio is one of the few individuals in the Adventure Time universe to have a highly detailed face; during the commentary for the episode, his design was compared to that of the face on the moon in the 1902 French silent film Le Voyage dans la Lune, based on H.G. Wells's 1901 novel The First Men in the Moon.[5]

After the episode aired, series composer Casey Basichis posted a video explaining his inspiration and method of producing the music featured in the episode. According to the video, Basichis created a "skeleton" of the score in his shower using his voice and a ukulele; the audio was captured on a phone. Originally, the score was going to have a "New York City, taxi, and jazz" feel, but Basichis was unhappy with the genre choice, and changed the feel.[6] For the music that played while the Ice King interacted with Ricardio, Basichis was inspired by the score from the original seven-minute short. In addition, opera singer Karen Vuong lent her voice to the episode. According to Basichis, Vuong was able to record her vocals successfully in one take. Basichis chose opera because he knew it had a reputation for being "sickeningly intellectual" and "preoccupied with murder", traits that he felt suited Ricardio.[6]

"Ricardio the Heart Guy" first aired on Cartoon Network on April 26, 2010. The episode was watched by 1.91 million viewers, and scored a 1.3/2 percent Nielsen household rating, meaning that it was seen by 1.3 percent of all households and 2 percent of all households watching television at the time of the episode's airing.[7] The episode first saw physical release as part of the 2011 Adventure Time: My Two Favorite People DVD, which included 12 episodes from the series' first two seasons.[8] It was later re-released as part of the complete first season DVD in July 2012; commentary for the episode was also included on the DVD.[9][10]

The episode garnered mostly positive reviews from critics. Matt Fowler of IGN, in a review of the My Two Favorite People DVD, noted that while "the idea of a walking, talking heart named Ricardio […] who plans to cut out Princess Bubblegum's heart is potent nightmare fuel", the show nevertheless "finds a way to make that grim idea accessible and fun."[11]

Takei's appearance as Ricardio gained critical favor. Charlie Anders of io9 named Takei's appearance in the episode as one of his "greatest moments", noting, "how could we have missed that Takei did the voice for this sleazy science-talking heart on Adventure Time, our new favorite show?"[12] Tyler Foster of DVD Talk called Ricardio one of the highlights of the season.[13] The A.V. Club reviewer Oliver Sava, in a review for "Lady & Peebles", wrote that Ricardio is "always welcome on this series, largely due to Takei’s delightful voice work."[3] Furthermore, he praised the way that Takei delivered his lines, noting that "there’s a theatrical smarminess to his vocals that is a stark contrast to the Ice King’s nasality", and that "Takei always sounds like he’s having a great time reading the ridiculous lines that are written for him."[3]

• "Ricardio the Heart Guy" at IMDb