The first season of Veronica Mars, an American drama television series created by Rob Thomas, premiered on UPN in the United States on September 22, 2004. The series was produced by Warner Bros. Television, Silver Pictures Television and Rob Thomas Productions, and Joel Silver and Thomas served as the executive producers.

Veronica Mars is the fictional protagonist, occasional narrator, and antiheroine of the American television series Veronica Mars, which aired on UPN from 2004 to 2006 and on The CW from 2006 to 2007. The character was portrayed by Kristen Bell through the duration of the series. Following the show's cancellation, Bell reprised her role in the 2014 film continuation and the 2019 revival that was released on Hulu. The character, created by Rob Thomas, was originally male and the protagonist of his unproduced novel Untitled Rob Thomas Teen Detective Novel, which eventually became the basis of the series. After the work transitioned from novel to television series, Thomas changed the character's gender from male to female because he believed that a noir piece told from a female point of view would be more interesting.