Duncan abruptly exits the party. Madison acts friendly and gives Veronica a cocktail, but Meg warns Veronica against drinking it because Madison has likely spat in it—a treatment Madison calls "A Trip to the Dentist." Veronica confronts Madison, who admits that at Shelly Pomroy's party she gave Veronica A Trip to the Dentist with her own (unbeknownst to her) drugged drink. Unable to unlock his car, Duncan flies into a rage and starts smashing it; coming upon him engaged thus, Meg chastises him and accuses him of still loving Veronica. Logan and Veronica start kissing but Logan stops to admit his role in Veronica's rape: at Shelly Pomroy's party, hoping simply to get him to relax, he gave Duncan a drugged drink. When Logan leaves Veronica alone to get some alcohol, she notices a camera in the ceiling fan. She investigates further and finds a hidden monitor and recorder, suggesting that Logan was in the habit of using them secretly to record his sexual conquests, and perhaps had planned to film Veronica. She leaves and Weevil gives her a ride home. Arriving home, she discovers her mother has returned and is sitting with her father. Arc significance Keith finds Duncan in Cuba. After a lengthy investigation, Veronica concludes that she and Duncan had consensual sex when they were both drugged. The Kanes believe that Veronica is Duncan's sister, and Keith learns that Abel Koontz couldn't have killed Lilly. Veronica goes public with her relationship with Logan before finding a series of cameras in his bedroom. Production The episode was originally called "Up on the Roofie", referencing the episode's theme of roofies, before being changed to the final title of "A Trip to the Dentist". "A Trip to the Dentist" has the return of several guest stars from a previous single episode, including Luke (Sam Huntington) from "You Think You Know Somebody", Cole (Daniel Bess) from "Like a Virgin", Casey Gant (Jonathan Bennett) from "Drinking the Kool-Aid", Sean Friedrich (Kevin Sheridan) from "An Echolls Family Christmas", and Carrie Bishop (Leighton Meester) from "Mars vs. Mars". Within the context of the episode, these characters reappeared so that Veronica could ask them what they knew about the party where she was raped. This episode reintroduces and resolves Veronica's rape, introduced earlier in the season. However, it had been largely ignored until this point in the series. The episode was the third and final