^ Shades of the way the Stargate series have artfully cast actors from other popular genre shows, by the looks of it.
That practice is hardly unique to Stargate. There are actors who keep cropping up across multiple genre series in both live action and animation. Heroes has plenty of genre veterans as supporting players. Terminator: The Sarah Connor Chronicles has Summer Glau and Heroes' Thomas Dekker as well as The 4400's Garrett Dillahunt. Dollhouse not only has Whedon vets Eliza Dushku and Amy Acker, but BSG's Tahmoh Penikett, The Matrix trilogy's Harry Lennix, and Journeyman's Reed Diamond. In animation, Justice League Unlimited had guest or recurring roles played by at least five Whedon veterans, as well as Trek veteran Jeffrey Combs, who was also in The 4400. And so on.
True. But as you can see, I was going for a short post and SG came to mind first, not least of all because Morena and fellow FF alumnus Jewel Staite have been in it. Besides, since SG has had actors from most of the modern Trek shows, FF and Farscape, I think (offhand) they're the most prolific at this sort of casting.
Not that there's anything wrong with it -gets the likes of us interested, right?!