Dark Empire Trilogy as Episode 7 - 9
I would consider Dark Empire as episode 7, Dark Empire 2 as episode 8, and Empire's End (Dark Empire 3) as episode 9. The "return" of Darth Sidious/Emperor Palpatine and the true death of The Empire makes this trilogy stand out and apart from all the other EU series. This in NO way means the other EU series aren't good. The Dark Empire Trilogy IS the turning point in the Galactic Civil War (in the EU). Cheers!
Re: Dark Empire Trilogy as Episode 7 -
I think you're either referring to the "slugs" that were by the side of Palpatine's head, which were added in during post-production because of lighting problems by his head. Or you may mean the strange rings around Palpy's eyes in TESB. They were used as make-up to make him look more menacing and evil or something, but were not used in ROTJ.