Ice King has kidnapped Princess Bubblegum. 'Ricardio the Heart Guy' was watched by 1.91 million people and received largely positive critical attention, with many reviews praising Takei's voice work. Basichis largely scored the episode with opera music, because he felt the genre suited Ricardio. After the episode aired, series composer Casey James Basichis posted a video explaining his inspiration and the method in which he produced the music featured in the episode. Ricardio would become a minor recurring villain, reappearing in the fourth season entry 'Lady & Peebles'. Ricardio reveals that he wants to 'make out' with Bubblegum's heart, but he is defeated by Finn and Jake. In this episode, Finn believes that Princess Bubblegum's (voiced by Hynden Walch) new friend, a heart named Ricardio, is evil, and is proven right after learning that Ricardio is the heart of the Ice King (voiced by Tom Kenny). The series follows the adventures of Finn (voiced by Jeremy Shada), a human boy, and his best friend and adoptive brother Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will.

The episode guest stars George Takei as the title character, Ricardio.

It originally aired on Cartoon Network on April 26, 2010. The episode was written and storyboarded by Bert Youn and Sean Jimenez, from a story by Merriwether Williams, Tim McKeon and Adam Muto.

' Ricardio the Heart Guy' is the seventh episode of the first season of the American animated television series Adventure Time.

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