Beast Wars.While Megatron had the same name he was not the same person as g1 megatron and this is explained further in the show. There were instances of g1 characters showing up(ravage) but it was a mostly new cast. You’ve generally got prime megatron and screamer in every g1 based show but other than that the cast is quite fluid
do the comics count?
Still counts as reusing megatron and optimus.
would it really be transformers without the generic cast?
I guess that's true, but still, it's just not right without the whole cast imo