The story of the planet Athena, located in the Cassiopeia constellation, which one day is attacked by space invaders who begin to suck its vital energy. A distress signal is sent into outer space by local astronomer Liza and picked up by four heroes who travel across the galaxy to save the planet.

Brazil in the early 70s. Miguel, Eloi, Osvaldo and Paolo take part in armed attacks against the military dictatorship. They pay a heavy price with torture and arrest. Today the four friends still see each other. Only Miguel is politically active. On a photograph from a political meeting in Sao Paolo he recognises the policeman who tortured them 25 years ago and who was responsible for the death of Miguel's girlfriend. The policeman has been officially dead for a few years. On one of their fishing trips together, Miguel tells his friends of his discovery. When they hunt down and confront their nemesis they come into conflict with both themselves and each other.

After failing to be admitted into the OSESP Orchestra, a talented violinist is forced to give music classes to teenagers in a public school. He soon finds his world transformed by the power of music and friendships formed with his pupils.