List of Transformers animated series had a show where Zarak replaced Galvatron and did not feature new characters, human Daniel Witwicky (who was in The Transformers: The Movie) played a major role.
Although populated mainly with new characters, The Headmasters did continue to feature characters from all previous seasons, including new versions of Soundwave and Blaster, rebuilt after a duel that destroyed them both as Soundblaster and Twincast. 
