Mulder purchased the original 24x36-inch poster from a head shop on M Street in Washington, D.C..

Released six years after the original series ended, this film was intended as a standalone "Monster of the Week" style thriller. The X Files: I Want to Believe (2008) - IMDb

The poster serves as a visual signal for the show's themes of hope and skepticism.

The poster has been destroyed and replaced several times throughout the series. In 2008, Gillian Anderson donated an original prop poster to the Smithsonian . The 2008 Film: The X-Files: I Want to Believe

It features a grainy image of a flying saucer hovering over a field of trees with the words "I WANT TO BELIEVE" printed in bold white type at the bottom.

The phrase "" is perhaps the most iconic mantra in The X-Files universe, representing Agent Fox Mulder’s career-long quest to find proof of the paranormal. It originated as a tagline on a UFO poster in Mulder’s FBI basement office and later became the subtitle for the second feature film in 2008. The Iconic Poster

While Mulder wants to believe, the phrase indicates an awareness of doubt and the fallibility of the evidence he chases.