- Jamie Bamber, Lee "Apollo" Adama form Battlestar.
- Michael Hogan, Saul Tigh from Battlestar.
- Alexis Denisof, Wesley Wyndam-Pryce from Buffy and Angel.
- Summer Glau, River Tam from Firefly and Serenity.**
In addition, Amy Acker and Alan Tudyk will be reprising their roles on the show.
I'm quite excited about this development.
* There are minor spoilers on the linked-to page.
** Once the Sarah Conner Chronicals was cancelled,*** you had to know it was just a matter of time before this happened.
*** Say that three times quickly!