T3: Sarah, Kyle, T1000
In the Special Edition DVD with the obligatory extra disc of special features they have a character profiles section which is sadly not as in-depth as I would have preferred. In that section the characters that appear in T2 but not T3 are all played by look-alikes.
Rather then taking scenes from T2/T1 or recasting the actors briefly they made these fictious scenes. You don't even get to see Sarah's face and the few glimpses you get of Kyle are obviously not Michael Bein. The T1000 never turns into Robert Patrick. Just seems odd that Mostow couldn't get a hold of any material from T2 and had to shoot these from scratch.
Any thoughts or explanations as to why this is the case. It's one of the things that bugged me about T3.