I only started watching The Dead Zone because it's being rerun right after reruns of Dead Like Me. I often turn it off--but I kept watching this one when I saw that Robert Culp was the guest star.
That's partly because Culp is such a skilled actor. But there's also another reason. Those of us old enough to be watching TV back in the 1960s remember Culp as spy Kelly Robinson in I Spy. Thus, we are able to draw on that three-year show as a back story for the character in this episode. And that provides a resonance that makes the story more affecting, as we see this portrayal of what the latter years of such a spy's life might be like.
The show couldn't have made a better choice of actor than Robert Culp to play the role of Jeffrey Grissom.