Gary Sinese playing a UNSC investigator looking into the theft of the Epsipod and Carolina's escape from a mental hospital. For extra lulz, have him deliberately parody all the CSI: NY tropes and clichés.
Elijah Wood is going to be epic in Season 10. However, I thought that Sigma was destroyed in the EMP that Wash set off. Did he survive somehow. If so, then did Alpha Church survive as well? P.S. It would be awesome to have Sean Astin (Sam in LOTR) in Season 10 and he could play another AI.