- Country: Germany
- Genres: Documentary
- Release: 1999-01-07
- Director: Christian Bau
- Writers: Christian Bau
- Language: N/A
- Stars: Bazon Brock , Hellmuth Costard , Helmut Herbst , Andy Hertel
- Runtime: 110 min
- Awards: N/A
- AKA: Die kritische Masse - Film im Untergrund, Hamburg '68 (Germany) , Die kritische Masse - Film im Untergrund, Hamburg '68 , The Critical Mass: Underground Film in Hamburg During the Sixties
- Plot: N/A
- IMDB:tt0188778