If all other gears shift fine, don't mess with the TV cable - your OD clutch is probably gone like the wind. If you have to drive the car, just put the shifter in drive - not OVERDRIVE, but I would think that the best thing to do is just stop driving it until it can be repaired, since there will be little pieces of the clutch floating around in the oil. One thing you can check real quick is where the TV cable attaches to the throttle body linkage - make sure that is all snug and intact. If it's not, definitely get that fixed!