Freeman's name reflects his nonconformist philosophy, which runs counter to the prevailing recklessness of his three ill-fated crewmates, who are eager to jettison their precious payload and return to the bleakness of Earth. Before they can sabotage the forests, Freeman does what he must, and spends the remainder of his mission with three robotic "drones" as his only companions, struggling to maintain his sanity in the vastness of space. Dern is superb in this memorable role, representing the lost soul of humankind as well as the back-to-nature youth movement of the 1960s and the pre-Watergate era. (Appropriately, Joan Baez sings the film's theme song.) A rare science fiction film that combines bold adventure with passionate social conscience, Silent Running will remain relevant as long as the Earth is threatened by the ravages of human carelessness. --Jeff Shannon