The purpose of this list is to enumerate things that were promised or otherwise hinted at during production but were not delivered. Soundwave: No visor, no synthesized voice, no robot mode, no earth mode. Sisters combining: Cancelled. Twins combining in robot mode: Cancelled? Sideways & Jolt: New bots, but no screentime given. Grindor/Blackout dilemma: Never explained (they said there was a reason for it) Hightower and Overload: No robot modes? Feel free to add your own (please no letdowns out of things you expected out of sheer 'fanboydom'; only things that were somehow promised to happen).