crashes his car into a concrete pillar. Pursued by two police androids on motorcycles, THX flees to the limits of the city and escapes into a ventilation shaft. The police androids pursue him on motorcycles along the shaft to an escape ladder, but are ordered by Central Command to cease pursuit, on the grounds that the expense of his capture exceeds their allocated budget for THX. The guards inform THX that the surface is uninhabitable in a last-ditch attempt to convince him to surrender, but he is undeterred and continues up the ventilation shaft. The city is then revealed to be entirely underground, and THX has escaped onto the surface, where he then witnesses the Sun setting. Cast Robert Duvall as THX 1138 Donald Pleasence as SEN 5241 Maggie McOmie as LUH 3417 Don Pedro Colley as the hologram actor SRT 5752 Ian Wolfe as the old prisoner PTO Marshall Efron as prisoner TWA Sid Haig as prisoner NCH John Pearce as prisoner DWY James Wheaton as the voice of OMM 0000 Additionally, amongst several 'announcer voices' were Scott Beach, Terence McGovern, and David Ogden Stiers (billed as David Ogden Steers). They had ties to the San Francisco Bay area, as did Lucas. Production THX 1138 was the first film made in a planned seven-picture slate commissioned by Warner Bros. from the 1969 incarnation of American Zoetrope. Lucas wrote the initial script draft based on his earlier short film, but Coppola and Lucas agreed it was unsatisfactory. Murch assisted Lucas in writing an improved final draft. For some of SEN's dialogue in the film, the script included excerpts from speeches by Richard Nixon. The script required almost the entire cast to shave their heads, either completely bald or with a buzz cut. As a publicity stunt, several actors were filmed having their first haircuts/shaves at unusual venues, with the results used in a promotional featurette titled Bald: The Making of THX 1138. Many of the shaven-headed extras seen in the film were recruited from the nearby Synanon, an addiction recovery program which became a violent cult. Filming began on September 22, 1969. The schedule was between 35 and 40 days, completing in November 1969. Lucas filmed THX 1138 in Techniscope. Most locations for filming were in the San Francisco area, including the unfinished tunnels of the Bay Area Rapid Transit subway system, the Lawrence Livermore National Laboratory, the Marin County