Christopher Judge (of Stargate SG-1) played the avatar for the biggest, baddest & most noble warship around, having held the remaining commonwealth ships (and their AIs) together for 300 years.
The Wrath of Achilles. Damn. It's really too bad they killed him off, he would have been an amazingly wonderful addition to the show.
On the down side, Iolus & Hercules are back together. Feh.