What happens at the end of transformers 3?

Answer 1

at the end of the original American G1 siries galvatron [a rebult megatron] was blown

with the other decipticons to the other side of the galaxy wih the hives that cintrol

decipticon city scorponoc.

In the japnese continue of g1 was headmasters this was the begining of the continue

of g1. the autbots had destroyed galvatron but megazarak or lord zarak became the new leader of the decipticons but his city scorponac retreated.this was the end of headmaster.

transformes master force was the next which in my opinion is the best out of all

and is to long to tell

the last series of transfomers g1 was victory were th last decipticon dezarus was destroyed

fact Transformers g1 the whole series was from 1984-1992 which consisted of

transformers transformers headmasters transformers masterforce transformers zone and transformers victory

Answer 2

Optimus Prime manages to kill both Megatron and Sentinal Prime, during the battle though Optimus manages to lose his arm.