The documentary begins as an exploration into the underground world of street art, spearheaded by Thierry Guetta, a French immigrant and vintage clothing store owner living in Los Angeles. Obsessed with documenting his life with a handheld video camera, Thierry becomes fascinated by the clandestine subculture of graffiti artists. Through his cousin, the prominent street artist Invader, Thierry gains unprecedented access to a global network of elusive creators, including Shepard Fairey and Zevs. His ultimate ambition, however, is to track down and film Banksy, the world's most infamous and anonymous street artist.After years of relentless pursuit and precarious stakeouts, Thierry finally manages to meet Banksy in Los Angeles, filming the elusive artist shrouded in shadows. Instead of being chased away, Thierry’s eager demeanor and constant documentation earn Banksy's trust. Banksy allows Thierry to accompany him on numerous nocturnal missions, filming dangerous wheat-pasting and stencil-painting escapades in major cities
around the world. As the footage accumulates, Banksy encourages Thierry to finally edit his massive mountain of tapes into a cohesive feature-length documentary about the history and impact of the street art movement.Thierry retreats to his studio and spends months frantically piecing the project together. However, the resulting rough cut is a disaster—an incoherent, seizure-inducing montage of random footage lacking narrative, structure, or artistic vision. Realizing Thierry is not a filmmaker, Banksy gently suggests that he take a step back from the editing bay, while Banksy himself attempts to take over the project to salvage something worthwhile.Faced with this creative rejection and inspired by the very artists he spent years filming, Thierry experiences a bizarre psychological pivot. Driven by delusions of grandeur, he reinvents himself overnight as a street artist named "Mr. Brainwash." Moving to Los Angeles, Thierry rents a massive warehouse, hires dozens of art students and graphic designers to mass-produce silkscreen prints, and pours his life savings into organizing an insanely ambitious, high-budget debut art exhibition called "
Life Is Beautiful."Despite having no prior artistic background, Thierry aggressively hypes the show through PR firms and street marketing. The exhibition opens to massive public acclaim and commercial success, selling hundreds of thousands of dollars worth of derivative, Andy Warhol-esque pop art. The documentary concludes with a bewildered Banksy and Shepard Fairey shaking their heads, acknowledging that whether Thierry is a visionary genius or a profound fraud, he successfully manipulated the art world's fickle nature to become a commercial sensation overnight.