The Transformers franchise has multiple timelines or "generations," with the first of these being retroactively known as Generation 1. In the 1990s, the franchise maximized into its most animalistic form through the Beast Wars subseries. This eventually became an acclaimed entry in the property, but it also connected Hasbro's toyline to a completely unrelated brand.
Source：https://www.cbr.com/animorphs-franchise-transformers-connection/
