The first Gemini was the 1974 Bellett Gemini. It was based on the third-generation Opel Kadett on the General Motors T-car platform and came in four-door sedan and two-door coupe body styles.
In addition, Holden in Australia offered the Gemini as a 3 door station wagon and van, which were derived from the Vauxhall Chevette wagon, with Gemini front panels. The Gemini was Wheels magazine's Car of the Year for 1975. The Australian Holden Gemini was fitted with an Isuzu G161Z engine, although some models were available with a diesel variant of an Isuzu G180 engine. The more common G161Z was a 1.6-liter 8 valve SOHC fed by a Nikki carburettor.
In Europe, the 1976 Gemini was equipped with a 1.3-liter engine known as the 1g13c, which was adopted by Opel in Germany for their Opel Kadett.
In Japan, sports models were available under the names ZZ/R and ZZ/T. These were equipped with an Isuzu G180W 8-valve DOHC 1.8-liter engine, most commonly fuel injected, producing 97kW at the flywheel. It is rumoured that these models also came with a factory LSD and a shortened shift throw on manual models.