User blog comment:RodimusPrimeHans-Cuff210/Rodimus' Random Ideas - Locked Room '18 and splinter timelines/@comment-27480112-20171105001330/@comment-27873981-20171105011545

Also:

Pirate Seas: Their crimes excused, the Gang's ancestors become part of an organization that protects towns from other pirates.

Egypt: IDK

Greece: IDK

Stone Age: The Gang's ancestors and Grimlock experience the Beast Wars (Transformers: Beast Wars happens).

Disco Era: Thanks to the work of the Gang's ancestors, the music remains the same quality in the following generations. Then the events of Voltes V happen.

Wild West: Galaxi the Kid and some other outlaws are brought to justice.

Surf Era: Galaxisand is brought down again and again by the Gang's ancestors in the following years.

Parallel Universe: Becomese the Shattered Universe for the events of Shattered.