Damaged DVD- any chance of rescuing it?

I’m not sure if this is the right place to post this but I have a DVD from a boxset of a tv series that has become damaged at a certain point. There is a visible mark, sort of as if the layer has been scratched off, at one point which is causing it to basically skip and get stuck and become totally unplayable at that point.

Is there any way to produce a less error-filled version so that I might be able to watch the end of the episode?

Can the damage be polished out?
If it is possible I advise you to go to a friendly DVD rental store and ask the staff if they could put it through their poishing/scatch remover machine. It may cost a little but at least you get the disc working.
Once this has been achieved back it up and only play the backup, when that gets damaged just make another copy.