Seriously? He has a regeneration unit. He looks totally different. When he gets damaged the regeneration unit kicks in and he is reborn as a completely new looking K-9. It is just simple logic. It's just like saying oh, we never saw Paul McGann regenerate (yet) so we cannot say Christopher Eccleston is a new regeneration, we can only say he looks different. Yeah. Oh well. I'm done. See you guys later. Hopefully not though.