Question: Which actress played a role in both Half Moon Street and Ghostbusters?
Context: The Half Moon Bay Art and Pumpkin Festival is an annual festival held in the coastside community of Half Moon Bay, California for one weekend during pumpkin harvest season.  It is one of the oldest and largest local festivals in California.  Proceeds go to local civic causes and to the beautification of the downtown area of Half Moon Bay. The Half Moon Bay is a bay and neighbourhood on Port Phillip, south east of Melbourne.  Located in the suburb of Black Rock, it is home to the Black Rock Yacht Club, the Half Moon Bay Lifesaving Club and the Cerberus Beach House Restaurant and Beach Kiosk.  This bay also gets a mention in the Cat Empire song, "The Wine Song".  Half Moon Bay is also home to HMVS Cerberus, the last surviving monitor warship in the world, which acts as a breakwater.  Half Moon Bay has a lifesaving club and a pier and has the Red Bluff Cliffs just along the beach.  The cliffs were briefly featured in the movie "Mad Max'" as well as the 90's children's television series "Round The Twist".  Half Moon Bay also has aquatic life which makes good snorkelling. Susan Alexandra Weaver (born October 8, 1949), known professionally as Sigourney Weaver, is an American actress and film producer.  Following her film debut as a minor character in "Annie Hall" (1977), she quickly came to prominence with her first lead role as Ellen Ripley in "Alien" (1979).  She reprised the role in three sequels: "Aliens" (1986), for which she was nominated for the Academy Award for Best Actress; "Alien 3" (1992), and "Alien Resurrection" (1997).  She is also known for her starring roles in the box-office hits "Ghostbusters" (1984), "Ghostbusters II" (1989), and "Avatar" (2009). The Half Moon is a Grade II* listed public house at 10 Half Moon Lane, Herne Hill, London.  It is one of only 270 pubs on the Campaign for Real Ale's National Inventory of Historic Pub Interiors, was frequented by the poet and writer Dylan Thomas, and was a noteworthy live music venue for nearly 50 years, hosting three gigs by U2 in 1980.  The Half Moon Public House is listed by Southwark Council as an Asset of Community Value. , and is described by Nikolaus Pevsner as, ""a cheerful corner pub of 1896"". Half Moon Pass Trail is in the northern Sawatch Range, part of the Rocky Mountains in the US state of Colorado.  It is located in the Holy Cross Wilderness northeast of Mount of the Holy Cross in Eagle County.  Half Moon Pass Trail is south of Interstate 70, south of Minturn, southwest of Vail and south of Beaver Creek Resort, Colorado.  Half Moon Pass Trail is accessible from Tigiwon Road, south of Minturn.  The hike from Half Moon Pass Trailhead, elevation 10,314 feet, to the summit of Mount of the Holy Cross and back to the trailhead is approximately twelve miles and ten hours.  From Half Moon Pass, the trail descends to East Cross Creek at 10,800 feet.  East Cross Creek is fed by Lake Patricia, high at 11,398 feet.  Past the creek, the trail ascends rapidly above the trees into a boulder field to the top of Mount of the Holy Cross, approximately six miles from the trailhead.  "Hiking Colorado: Holy Cross Wilderness", a hiking guide by Kim Fenske, provides a description of Half Moon Pass Trail. Naples Creek is a stream in San Mateo County, California, United States that rises on the western slopes of the Santa Cruz Mountains and discharges to the Pacific Ocean.  The specific point of discharge is onto Naples Beach, a unit of the Half Moon Bay State Beach.  This watercourse runs through the city of Half Moon Bay, which municipality has planning jurisdiction over the creekside area within its city boundaries.  In the Open Space Element of Half Moon Bay's General Plan, Naples Creek is designated to have significant wetland and riparian zone biotic resources. Half Moon Bay is a bay of the Pacific Ocean on the coast of San Mateo County, California.  The bay is approximately semi-circular, hence the name half moon, with sea access to the south.  Coastal towns located there are Princeton-by-the-Sea, Miramar, El Granada, and the city of Half Moon Bay. Half Moon Street is a 1986 British-American erotic thriller film about an American woman working at a British escort service who becomes involved in the political intrigues surrounding one of her clients.  The film was directed by Bob Swaim, and stars Sigourney Weaver, Michael Caine, and Patrick Kavanagh. Half Moon Street is a street in the City of Westminster, London.  The street runs from Curzon Street in the north to Piccadilly in the south. Half Moon Pond State Park, also known as Half Moon State Park, is a wooded campground state park located within the 3,576-acre Bomoseen State Park in the town of Hubbardton, Vermont.  The campsites are located on Half Moon Pond.
Answer: Sigourney Weaver