This article is from the The Terminator FAQ, by Karsten A. Loepelmann kloepel@connect.ab.ca with numerous contributions by others.
Lance Henriksen (ALIENS, ALIEN^3, Hard Target) was originally cast as the
Terminator (O.J. Simpson was considered for the role as well!); Henriksen was
recast as the cop Vukovich.
From Gale Ann Hurd <Film1999@aol.com>:
FYI, Arnold was *never* cast as the hero. That is a myth that seems to
have become fact as the years have passed. We (Jim Cameron and I) met
Arnold, and the part that Michael Biehn played was never mentioned -- all
of us were in agreement that he should play the title role of the
Terminator.
 
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