Thierry Guetta, an eccentric French shopkeeper living in Los Angeles, becomes obsessed with filming every moment of his life after inheriting a video camera. His casual filming takes a turn when he discovers the world of street art through his cousin, known as Space Invader, a renowned street artist. This newfound interest leads Guetta to meet and film numerous prominent street artists, including the secretive and legendary Banksy. Guetta manages to gain the trust of these artists and documents their daring and often illegal endeavors, capturing the raw and unpredictable nature of street art culture on tape.

As Guetta continues to film, he amasses an extensive archive of footage but exhibits no intention of actually producing a coherent documentary. Recognizing Guetta's lack of direction, Banksy takes over the project to create a film about Guetta's journey. This collaboration reveals surprising twists and turns in the street art world and Guetta's evolution within it. The narrative explores themes of authenticity, artistic expression, and the commercialization of street art, leaving the audience to question the fine line between genuine creativity and constructed hype.