Isn't that the show from the 80s with the shoulder pads and the who shot J.R.?
Yes. Yes, it is. The same show. Not a remake, but a continuation with many of the same characters and actors. But fear not: you can absolutely watch it and love the crap out of it without having seen any or all of the fourteen seasons that came before. In fact, I'm going to write this assuming you haven't seen the original, but if you're a fan and you want to know how something fits in, I'll be glad to answer questions in the comments.
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Season three starts Monday February 24 at 9:00 Eastern on TNT. TNT will be re-running all 25 episodes beginning at 8:00 Eastern on Sunday February 23.