Dentro do filme do Dia do Julgamento (e da novelização do filme) não há indicações de quem o T-1000 foi baseado. Ele é simplesmente descrito como tendo ...
...a handsome face, with strong features framed by military-short brown hair. His gray-blue eyes were furrowed with deep concentration, confident. - Randall Frakes - Terminator : Judgement Day
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A NAKED MAN glides from a shadowed doorway behind the cop. Nothing special about him. Certainly not built like a terminator. The flash of light and fact that he is naked are pretty good clues that he just arrived from the future. His features are handsome bordering on severe. His eyes are gray ice. Penetrating. Intelligent.- Terminator : Judgement Day Screenplay
O diretor do quarto filme Terminator (McG) falou sobre a idéia de incorporar um Robert Patrick mais velho em seu próximo filme como cientista que está trabalhando em nanotecnologia:
TheArnoldFans: Will we possibly have a return of Robert Patrick in a CG form?
McG: Funny, I talk to Robert Patrick with great regularity. It's interesting and i'll bounce it off of you guys (McG begins to lower his voice and leans in closer to me so the other press tables don't hear). I mean, I like the idea and the perspective for the next picture that you meet Robert Patrick the way he looks today...and he's a scientist that's working on, you know, improving cell replication so we can stay healthier and we can cure diabetes and do all these things that sound like good ideas...and to once again live as idealized expressions as ourselves.
So imagine seeing a 60-year-old Robert Patrick and KNOWING 'holy shit' that's GOING TO BE the T-1000 who comes back perfect, lean and the whole thing (McG makes the T-1000 "naughty naughty" finger swaying movement). I haven't concluded that but Robert and I had dinner the other night. - TheArnoldFans ComicCon Interview