O Que É Isso, Companheiro? was released in the year 1997。O Que É Isso, Companheiro? is also called as 4 dage i september, 4 giorni a settembre, 4 zile în septembrie, Arba'a Yamim B'September, Quatre jours en septembre, Fire dage i september, Four Days in September, Four Da, Cuatro días en septiembre。
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.