Although sea spiders are not true spiders, or even arachnids, their traditional classification as chelicerates would place them closer to true spiders than to other well-known arthropod groups, such as insects or crustaceans.
If you have an HDTV, we strongly recommend that you buy a Blu-ray player rather than a standard DVD player. Prices for Blu-ray players now start at less than $100, but expect to pay a bit more for a major-brand player that has 3D and wireless capbility.
Philips still makes a few DVD players in the USA/Canada that can be made region free. Their DVD players can convert between PAL and NTSC so they could play your DVD. It's very difficult to find BluRay players in the USA/Canada that are region free even if just for DVD.