"Debasement Tapes" is the seventeenth episode of the third season of the American mystery television series Veronica Mars, and the 61st episode overall. Written by John Enbom and directed by Dan Etheridge, the episode premiered on The CW on May 8, 2007. The series depicts the adventures of Veronica Mars (Kristen Bell) as she deals with life as a college student while moonlighting as a private detective.

In this episode, Piz (Chris Lowell) gets the chance to interview one of the members of his favorite band, a washed-up rock star named Desmond Fellows (Paul Rudd). However, when Desmond's backing tapes that he needs for the show the next night disappear, Veronica is called in to find them. Meanwhile, Logan (Jason Dohring) enlists Mac's (Tina Majorino) help in creating a presentation for his business class. In addition, Keith (Enrico Colantoni) learns that Vinnie Van Lowe (Ken Marino) is challenging him in the upcoming Sheriff election.

"Debasement Tapes" features a guest appearance by Paul Rudd. A friend of series creator Rob Thomas and Enbom, they had hoped that Rudd would guest star on the show since its inception in 2004. Announced four months prior to the episode's airing, his appearance was highly anticipated by Thomas, who had high hopes for the pairing of Rudd and Enbom. In its original broadcast, the episode received 1.85 million viewers and mostly positive reviews from television critics, with Rudd's performance and the various subplots being generally well-received, although some disliked the main mystery.

Veronica and Wallace (Percy Daggs III) watch a movie at her house. She questions him about Piz’s mood, while Keith enters and says he is currently unopposed in the Sheriff election. Piz runs up to Veronica and states that he has been chosen to be a guide for a rock star named Desmond Fellows. However, his show depends on some tapes Desmond is carrying with him, but when Piz checks him into his hotel room, they are missing. Piz calls Veronica for the case and runs into Logan in the elevator. Desmond points to several potential suspects. Logan asks Mac for study help, and she agrees. Piz starts his show with Desmond, and it goes terribly, as Desmond makes racial epithets and sexual advances. Veronica and Piz track down a teacher, who denies involvement, but the pair find a flyer for a group that threatened to boycott Desmond’s show. Piz and Desmond talk about his past and start to make progress, but he ends up going to a party with Dick (Ryan Hansen) instead of playing guitar with Piz.

Logan and Mac continue to make progress on his business school report, but Mac has to call Max (Adam Rose) to continue. Desmond goes skinny dipping at his party, while Mac and Max flirt in front of Logan. Veronica discovers that Desmond’s bag was actually switched with another person’s. Veronica and Piz retrieve it, and on the car ride home, they briefly discuss their kiss at the party before playing a CD with some of Desmond’s unreleased newer material. Keith reconnects with Leo D’Amato (Max Greenfield), who presents a case involving the Fitzpatricks to him. They stake out where the Fitzpatricks are, and Keith sees Vinnie Van Lowe helping them. However, they quickly learn that Vinnie is actually investigating the case and has trapped them in the store. Veronica and Piz supposedly get stuck in traffic and tell Desmond to play some of his newer songs until they get there, but they actually are at the concert venue and just want him to expose the audience to his solo material.

Desmond plays a show entirely of new songs, and the crowd loves it. Piz tells Desmond that he was there the whole time, but he does not react negatively. Mac, Max and Logan finish their report, but the professor cuts Logan off in the middle and dislikes it. Leo becomes a deputy again, while Vinnie enters the Sheriff’s office and states his intention to run against Keith in the special election.

"Debasement Tapes" was written by John Enbom and directed by supervising producer Dan Etheridge, marking Enbom's seventeenth and final writing credit for the show and Etheridge's first and only directing credit for the series. The episode guest stars actor Paul Rudd as former rock star Desmond Fellows. During casting of the character of Vinnie Van Lowe, Rudd was considered to play the part; however, the role was given instead to Ken Marino, who appears in the episode. Marino and Rudd are friends in real life. Rudd was a friend of Enbom and Etheridge, and he had been signed on to appear in the episode by the airing of "Spit & Eggs". They had lobbied Rudd to come on the show for several years. Thomas described the reason for Rudd not appearing earlier being that the crew were unable to find a good moment for the character's entry that worked with Rudd's schedule.

Series creator Rob Thomas thought that the character would be a perfect role for Rudd, stating that he would perform it in a British accent and had high expectations for the comedy of the episode because it was being written by Enbom. However, Thomas did not release any details about Rudd's plot line in the episode before its airing. Rudd compared his character to Andrew Ridgeley and Peter O'Toole. In the scene in which Veronica meets Desmond, the film of camera angles while Kristen Bell was speaking were inadvertently destroyed, leading to these camera angles being filmed nearly six weeks later. Bell had to speak her lines without Rudd present.