The thirteenth episode of Whedon's Dollhouse was never apparently part of Fox's studio deal, but for foriegn release was highly desired, so Whedon apparently responded:
So viewers can now either get the DVD set, or download the episode from iTunes or Amazon on Demand. The episode is well worth it by any means. Not only is it impressive that one of the best episodes of the season isn't technically in the season and cost half as much, it offers some great points on the problems and ideas raised by Dollhouse's premise. Rest assured, this doesn't feel like a tacked on piece of filler - there's a lot of meat to be had here.
Without going into much detail, what I think is most interesting here is the willingness to show the dark side of some "post singularity" concepts about the mind, body and immortality in general. It's a specific and unique kind of apocalypse being built up here, and shows a lot of expansion for the show to grow into.
Highly recommend, especially for Dollhouse fans waiting for the second season.