Critical Mass began in San Francisco in 1992 as a monthly bike ride and grew into a leaderless, worldwide phenomenon, with cyclists gathering in more than 200 cities across 14 countries to take over the streets for an afternoon. Director Ted White traces that spread through footage of rides in Austin, Copenhagen, London, and Sydney, alongside interviews with organizers and officials who find the movement impossible to negotiate with because it has no leaders to negotiate. The film treats Critical Mass as both protest and street party, a commercial-free public gathering that brings out road rage from drivers and genuine confusion from police trying to figure out who is in charge. It also spends time on the art the movement produced, including muralist Rigo23's traffic-sign paintings and work by Jim Swanson and Beth Verdekal, treating the visual culture as part of the politics rather than decoration around it. The result is a case study in how a monthly ride against car dominance turned into an international ritual with its own successes, failures, and iconography.