Generation One, originally known as The Transformers, is the original Transformers franchise which took the United States by storm in 1984.
The term "Generation One" (G1) was originally a fan-coined back-formulation of Generation 2. Until the Transformers: Generation 2 line was released, Generation One was simply called The Transformers. Over the years, the use of the term G1 has become fairly universal and has frequently been used in official materials. It has even appeared on Takara toy packaging and on Hasbro's official Transformers website and reissue toy packaging.
The Generation One franchise as it ran in the 1980s/90s featured the following primary components:
A toyline
A cartoon series
Several comic book series
Generation One also included an avalanche of ancillary licensed merchandise, more so than any other Transformers franchise outside of Japan. This has resulted in a higher number of Micro-Continuities in G1 than in any other Transformers franchise. This licensing was revived in the early 2000s due to retro-appeal at retailers like Hot Topic. It has continued at varying levels of intensity since.