The original OP is still on the BD version of the episodes and the theatrical releases.
An even more spoiler laiden clip form episode 21.
Do not watch if you don't want to be spoiled. This is about a delivery to a Gamilas prison world of a very special guest and the reenforment of how race has a pecking order in the Empire. (also that Commander Wulf is really a good guy under that mustache...and a badass)