Friedman wanted to bring back Kyle Reese, the time traveler who fathered John Connor and then died in the first Terminator movie. But his fellow producers convinced him this would never fly with the fans. So instead he finally agreed to introduce Reese's brother, Derek, played by 90210's Brian Austin Green.
Um, yes, because the fans would much rather see Brian Austin Green than Michael Biehn. Good call there, producers! I hope cousins Coy and Vance Reese stop by soon.