Well, whatever the reason it's a blow. They must have gone to at least a little trouble to continue with them after a decade. Maybe the demand seemed greater than it was. I must confess I've yet to purchase Parts Three, Four and Five. I've a huge backlog of series to watch and since there was no slipcase to entice me I didn't see the rush. Now I feel nothing but monochromatic, back-of-hand-to-forehead shame.