Don't bother - unless you really need to see one more episode

This release is a bit of a con. You get one more episode (and not a very good one) lasting the usual 20-25 minutes, and a bunch of 'extras', doubtless in a (failed) attempt to justify the existence of this thing by adding more content. But the extras are just cut & paste jobs from everything that's already been in the series, and nothing new. If you really feel you need to see these last 20 minutes, go ahead and rent it, but that's all it has to offer. This episode should have been stuck on the last regular series disc, not released on its own.