What if Megatron shows up in Transformers: RiD as a sort of lone wanderer/sixth ranger type character occasionally helping BB’s team from the sidelines as a means of settling-his-past type of deal? And he could wear a tarp cowl similar to DOTM!Megatron, thus simplifying his design and better fitting in with the new animation and style.
If they involve him I think it would be a resurgent Unicron Threat or something very high threat the Bots need help taking.
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