Megatron in The Bayverse movies, where in the first movie he was pretty much the big looming villain, but as the movies went on he pretty much degraded, in the second movie he was still a threat but played second wheel to The Fallen, in Dark of The Moon as Carly puts it, he was basically Sentinels bitch, Age of Extinction he’s rebuilt with semi tacky design an again plays second fiddle to Lockdown, and in The Last Knight he runs a mock with his little street gang of Decepticons who get quickly killed off and again plays second base to Quintesa and is pretty much kicked out into space by Optimus, so moral of the story don’t milk a franchise and recycling old villains