The Opel GT is a two-seater sports car that was first presented at the 1965 Paris and Frankfurt auto shows. It was first produced in 1968 by Opel, which is the German subsidiary of GM. The car relied on parts from the Kadett B, and the body was made by French company Brissoneau and Lotz. Stylistically, it has drawn comparisons to the 1968 Chevrolet Corvette.

The GT was only produced for six years originally; it returned after 34 years as a model based on Saturn's Sky coupe. In fact, it was built at the same plant as the Sky, in Wilmington, Delaware. That plant closed in 2009, meaning the end of production of both models. The Opel GT came equipped with a 1.1L 4-cylinder engine, which produced just 67hp. However, most customers chose to install a 1.9L engine that produced 102hp. Some early production models came with a higher-compression cylinder head, designated by an "H" code.

The car used a traditional front engine, rear wheel driven layout and steel unibody construction. The engine was mounted rather far back in the chassis, which helped with weight distribution. The Opel GT's front suspension was made up of upper A arms and a leaf spring, with coil springs and live axle in the rear. Steering was unassisted, but the power brakes used drums in the rear and discs in the front.

One of the Opel GT's standout features was its hideaway headlights. They were manually opened and closed via a lever located next to the gearshift. Unlike most similar headlights, they rotated in the same direction along a vertical axis. The GT was designed as a fastback, and it had no easily accessible storage area. It was Agent Maxwell Smart's car of choice on the TV show "Get Smart".