Hawk The Slayer On Lost
I just found out why Jack's dad on Lost looked so familiar: the actor is none other than John Terry, who was Hawk The Slayer. He also has a recurring role on Las Vegas (I'm sure I've seen him without realizing it was him), 24 (I tried watching an episode when it first started and couldn't get into it) and ER (I stopped watching this show shortly after George Clooney left). I guess his gray hair really threw me and I should pay more attention to the supporting cast.