The era of manned trips to the Moon in 1969 and the 1970s saw a resurgence of interest in the science fiction film. Andrei Tarkovsky's "Solaris" (1972) and "Stalker" (1979) are two widely acclaimed examples of the renewed interest of film "auteurs" in science fiction. Science fiction films from the early 1970s explored the theme of paranoia, in which humanity is depicted as under threat from sociological, ecological or technological adversaries of its own creation, such as George Lucas's directional debut "THX 1138" (1971), "The Andromeda Strain" (1971), "Silent Running" (1972), "Soylent Green" (1973), "Westworld" (1973) and its sequel "Futureworld" (1976), and "Logan's Run" (1976). The science fiction comedies of the 1970s included Woody Allen's "Sleeper" (1973), and John Carpenter's "Dark Star" (1974).