When I rebuilt the PC, I forgot to install the libdvdcss2 package that allows Ubuntu to play restricted content. Easy enough to fix, open a terminal and type:
sudo apt-get install libdvdread4
You may also need the dvdspu gstreamer plugin:
sudo apt-get install totem-gstreamer
With the plugins loaded, Movie Player played the first episode but wouldn't give me access to the menu nor allow me to jog to the next chapter. I switched to xine and was good to go.