The Joker is a roller coaster located at Six Flags Great Adventure, Six Flags Great America, Six Flags New England, and Six Flags Over Texas.
 Built by S&S Worldwide, an American ride manufacturer, the coaster is one of their "Free Spin" models.
 Since 2016, Six Flags has installed The Joker in four of their parks.
Thunderbolt is a wooden roller coaster located at Six Flags New England.
 Opened in 1941, It was designed by Harry Baker and Harry Traver, and built by Joseph Drambour.
 Thunderbolt is the oldest roller coaster at Six Flags New England.
 It is also the oldest roller coaster in any Six Flags park (the Wild One at Six Flags America was built in 1917, but it was relocated from Paragon Park and has only been at Six Flags America since 1986).
 The single PTC train has 4 cars, and an individual lap bar and seatbelt for each person.
 An attendant has to manually unlock each car's lap bars by stepping on and pushing down a release bar at the front of each car.
 Thunderbolt was dedicated an ACE Coaster Landmark on August 2, 2008.
Geauga Lake is an abandoned theme park in Bainbridge Township and Aurora, Ohio, United States.
 Established in 1887 in what had been a local recreation area adjacent to a lake of the same name, the first amusement ride was added in 1889, and the park's first roller coaster – later known as the Big Dipper – was built in 1925.
 In 1969, the park was sold to Funtime, Inc., and was expanded over the years with additional rides and amenities.
 Further expansion occurred in the mid and late 1990s after Funtime's acquisition by Premier Parks in 1995.
 Prior to the 2000 season, soon after Premier Parks acquired Six Flags, the park was re-branded as Six Flags Ohio and four new roller coasters were added.
 A year later, Six Flags bought the adjacent SeaWorld Ohio and combined the two parks under the name Six Flags Worlds of Adventure.
Superman: Ultimate Flight is a steel flying roller coaster designed by Bolliger & Mabillard.
 Themed to the popular comic book character, "Superman: Ultimate Flight" has been installed at three Six Flags theme parks around the United States: Six Flags Over Georgia, Six Flags Great Adventure and Six Flags Great America.
 "Superman: Ultimate Flight" simulates flying by positioning its passengers parallel to the track, supported by harnesses and facing the ground through most of the ride.
 In the station, riders board the train sitting down.
 After the train is locked and checked, the trains are raised into the flying position.
 After the ride, the seats are lowered back into the sitting position for the next round of riders.
Monster Mansion (formerly Monster Plantation) is a family & kids style Mill Chute dark ride at Six Flags Over Georgia located in Austell, Georgia.
 Aboard 6-passenger boats, riders pass through nine scenes along the 700' foot-long flume, passing by over 107 original audio animatronic characters.
 Outside of Disney parks, it is the world's largest animatronic-based family dark ride.
 The new "Monster Mansion" incarnation also features more 4D effects than any other ride in the world.
Giovanola Freres SA was one of the prominent thrill ride manufacturers in the world.
 It was well known for thrill rides and also built electrical power stations, water storage tanks, pipelines, highway bridges, and many other steel products.
 The company started out as a small metal forging shop, founded by Joseph Giovanola in 1888.
 It served as a subcontractor to Intamin supplying rides and roller coasters.
 In 1998 Giovanola started marketing directly under the name Giovanola Amusement Rides Worldwide.
 The company was based in Monthey, Switzerland.
 During its last years in business, Giovanola fashioned steel behind the scenes for companies such as Intamin and Bolliger & Mabillard.
 The company also built its own thrill rides and roller coasters from 1998 to 2001.
 Examples of Giovanola roller coasters are Goliath at Six Flags Magic Mountain, Titan at Six Flags Over Texas and Anaconda at South Africa's Gold Reef City.
Six Flags Over Georgia is a 290 acre theme park located west of Atlanta in Cobb County, Georgia, United States.
 Featuring characters and themes from a variety of Warner Bros. properties such as "Looney Tunes" and DC Comics, the park opened to the public in 1967 as the second of three theme parks built by Six Flags.
 It features ten roller coasters, including top-ranked Mind Bender and Goliath that have been recognized annually by "Amusement Today", and over 30 other rides, shows, and attractions.
 Hurricane Harbor, a 7 acre water park included in the price of admission to the amusement park, was added in 2014.
Goliath is a steel roller coaster made by Giovanola of Switzerland.
 The hypercoaster is located in the Screampunk District area of Six Flags Magic Mountain in Valencia, California and is promoted with a sub-tropical theme that is characterized by ruins of the ancient Mayan civilization.
 The ride is nearly identical to Titan at Six Flags Over Texas.
 Its differences from its Six Flags twin is that Goliath lacks the 540-degree upward helix on Titan prior to the mid-course brake run (Goliath simply banks left to the brake run instead) and Goliath is also slightly shorter than Titan.
Goliath is a steel coaster roller coaster at the La Ronde located in Montreal, Quebec, Canada.
 Designed by Bolliger & Mabillard, it reaches a maximum height of 174.8 ft , a speed of 68.4 mph , and a track length of 4038.8 ft .
 Construction commenced in September 2005, and the roller coaster opened to the public on May 13, 2006.
 Goliath was the tallest and fastest roller coaster in Canada until it was surpassed by Behemoth (another Bolliger & Mabillard roller coaster), at Canada's Wonderland's in 2008.
 Six Flags announced that Goliath would be hooked up with Virtual Reality for a New Revolution experience for the 2016 season, which was previously made as a world premiere in 2013 by a Montreal VR company.
The Dark Knight Coaster is the name of three enclosed steel roller coasters that are currently operating at Six Flags Great Adventure, Six Flags Great America and Six Flags México.
 They opened in 2008 and 2009, timed closely to the theatrical release of "The Dark Knight".
 The roller coasters are manufactured by Mack Rides.

Question: At Six Flags Over Georgia, opened in 1967, featuring the Goliath and Monster Mansion rides, which company's characters appear?
Answer: Warner Bros.