ok, i was watching the episode "The Fifth Race" where O'Neil gets that weird knowledgy thing and he learns about the ancients. so at the end the asgards tell o'neil there were four supreme races in an alliance againist the goa'uld. i know the asgard and the nox, what were the other two races? was one of them the reetu (sorry, don't know the spelling for that). if so, why did the attack the humans which might be the fifth supreme race?