O Que É Isso, Companheiro? was released in the year 1997。O Que É Isso, Companheiro? is also called as Four Da, Four Days in September, Fire dage i september, Cuatro días en septiembre, Arba'a Yamim B'September, 4 zile în septembrie, 4 giorni a settembre, 4 dage i september, Quatre jours en septembre。
Fernando, a journalist, and his friend César join terrorist group MR8 in order to fight Brazilian dictatorial regime during the late sixties. Cesare, however, is wounded and captured during a bank hold up. Fernando then decides to kidnap the American ambassador in Brazil and ask for the release of fifteen political prisoners in exchange for his life.