Question: What transportation with gull-wing doors was used in the Back to the Future franchise?

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Manta Mirage: The Manta Mirage was a mid-engined vehicle produced by Manta Cars, owned by brothers Brad and Tim LoVette, in Costa Mesa, California* from 1974 to 1986.  The Mirage, originally referred to as just the 'Manta', or the 'Manta Can-Am', was a light-weight road-legal car, based loosely on the McLaren M8 Can-Am racing car.  The Mirage's steel space frame chassis was fitted with a high-output V8 engine and 4-speed transaxle.  Most Mirages were equipped with 327 cu.  in.  (5.4 L) or 350 cu.  in.  (5.7 L) Chevrolet small block V8 engines, though some used 454 cu.  in.  (7.4 L) or 460 cu.  in.  (7.5 L) V8 engines.  The original Mirage design mated the Chevy V8 to a Corvair transaxle via a Kelmark adapter and remote shifter.  The bodywork was all hand-laid fiberglass, pre-colored in a range of gel-coat colors.  Gull-wing doors were fitted to a removable top section, while the doors flip forward for entry.  With curb weights as light as 1,900 lbs (680 kg), the cars could be built by the factory or their owners to be extremely fast.

BMW Nazca C2: The BMW Nazca C2 (also known as Italdesign Nazca C2) was a 1992 concept sports car.  The car was designed by famed automotive engineering company Italdesign, home of Giorgetto Giugiaro, and features a similar frontal design of a BMW.  It was an evolution of the previous concept the Nazca M12 from 1991.  The engine used was a modified version of the 5.0 liter V12 used in the BMW 8 Series tuned by Alpina.  It originally had 380 HP.  The car had a top speed of 193 mi/h .  Three cars in total were produced.  The car's aesthetic features included Semi gull-wing doors, full glass top and all carbon-fiber-reinforced polymer construction.  The car was intended as an official replacement for the BMW M1 super car from the '70s - '80s, but BMW was hesitant at producing another mid-engined super car after the M1 flopped, so they pulled the plug.  BMW allowed ItalDesign to use their name and grill solely on the 3 concept cars built.

DeLorean Motor Company: The DeLorean Motor Company (DMC) is an American automobile manufacturer originally formed by automobile industry executive John DeLorean in 1975.  It is remembered for the one model it produced — the distinctive stainless steel DeLorean DMC-12 sports car featuring gull-wing doors—and for its brief and turbulent history, ending in receivership and bankruptcy in 1982.  Near the end, in a desperate attempt to raise the funds his company needed to survive, John DeLorean was filmed appearing to accept money to take part in drug trafficking, but was subsequently acquitted of charges brought against him on the basis of entrapment.

DeLorean DMC-12: The DeLorean DMC-12 (commonly referred to simply as "the DeLorean," as it was the only model ever produced by the company) is a sports car manufactured by John DeLorean's DeLorean Motor Company for the American market from 1981–83.  The car features gull-wing doors and an innovative fiberglass body structure with a steel backbone chassis, along with external brushed stainless steel body panels.  It became widely known and iconic for its appearance, and a modified DMC-12 was immortalized as the DeLorean time machine in the "Back to the Future" media franchise.

Mercedes-Benz C111: The Mercedes-Benz C111 was a series of experimental automobiles produced by Mercedes-Benz in the 1960s and 1970s.  The company was experimenting with new engine technologies, including Wankel engines, diesel engines, and turbochargers, and used the basic C111 platform as a testbed.  Other experimental features included multi-link rear suspension, gull-wing doors and a luxurious interior with leather trim and air conditioning.

Mercedes-Benz 300 SL: The Mercedes-Benz 300 SL (W198) was the first iteration of the SL-Class grand tourer and fastest production car of its day.  Introduced in 1954 as a two-seat coupé with distinctive gull-wing doors, it was later offered as an open roadster.

DeLorean time machine: The DeLorean time machine is a fictional automobile-based time travel device featured in the "Back to the Future" franchise.  In the feature film series, Dr. Emmett Brown builds a time machine based on a DeLorean DMC-12 car, to gain insights into history and the future.  Instead, he ends up using it to travel over 130 years of Hill Valley history (from 1885 to 2015) with Marty McFly to change the past for the better and to undo the negative effects of time travel.  One of the cars used in filming is on display at Universal Studios Hollywood.

Mercedes-Benz SLS AMG: The Mercedes-Benz SLS AMG (C197 / R197) is a front mid-engine, 2-seater luxury, limited production supercar automobile developed by Mercedes-AMG of German automaker Mercedes-Benz and was the first Mercedes-Benz automobile designed in-house by AMG.  The car, which has gull-wing doors, was the successor to the Mercedes-Benz SLR McLaren and was described by Mercedes-Benz as a spiritual successor to the Mercedes-Benz 300SL Gullwing.  SLS stands for "Sport Leicht Super" (Sport Light Super).  The Mercedes-Benz SLS AMG was assembled largely by hand, with its chassis and aluminum body shell produced by Magna Steyr in Graz, Austria and then transferred to Sindelfingen, Germany for assembly, with its engine being hand built by AMG in Affalterbach, Germany.

Melkus RS 1000: Melkus RS 1000 is a sports car produced by Melkus.  It is a sleek sports car powered by a tuned mid-mounted 3-cylinder 2-stroke 992 cm engine similar to the one in the Wartburg 353.  It has gull-wing doors.  101 cars were made between 1969 and 1979 in the Dresden factory.

Dooring: Dooring is a traffic collision in which a cyclist is struck by a car door.  The width of the door zone in which this can happen varies, depending upon the model of car one is passing.  The zone can be almost zero for a vehicle with gull-wing doors or much larger for a truck.

Supporting paragraphs: DeLorean time machine DeLorean DMC-12
Answer: DeLorean DMC-12