Santamaria and Urtigo are two bandits on the run, one is white, the other black. Santamaria is a mystical visionary and believes in the imminent coming of a purifying angel. Urtiga, his inseparable companion, is a simple-minded and ingenious man who follows Santamaria around and participates in the crimes he commits. The two bandits take over a house after kidnapping its owner and his girlfriend.

Edson is having an affair with actress Maria do Rosário, who dreams of being a movie director. So he tries to get some easy money for her film, but is arrested and meets a police torturer instead.

The quasi-fictional story of transgender sex workers living in Rio de Janeiro's swampy red light district, who are joined by a group of hippies and a runaway stockbroker, "Mangue-Bangue" is the paradigmatic expression of the post-1968 spirit of desbunde, the Brazilian slang catchword for "sex, drugs, and rock 'n' roll".