OK based on what I have read I can finally say this: in a showdown between gordon freeman, a sc2 marine, a spartan, a jedi, a combine elite, a captain picard/kirk, it would mainly be down between the jedi, gordon, and the spartan, gordon being the first to go (sad to say) then the spartan next (also sad to say) leaving the jedi (not to hard to say saying I'm a sw nerd)
technology wise: high charity, halo, combine tech, sc2 tech, deathstar, enterpise A-E, Its a battle between starwars and halo. halo would win though do to more advance shielding tech and the fact that halo can kill any thinking thing within 25000 lightyears.
to clear up some questions: a lightsaber can in fact cut through everything listed (yes, it can cut through the spartans shields) The reason why the forerunners died out was due to the fact that you can "destroy" the flood completley without starving it to death (without a new human body, a infected form would die after its body fell apart (probably due to age)) and thus created halo, the ark, and onyx. after preserving all the living races besides themselves, they activated halo before they could reach onyx do to the flood.
finaly, in a bloody war between all, halo would win hands down. halo would kill them all (except for the forerunners/other halo people who hid in onyx)
technology wise: high charity, halo, combine tech, sc2 tech, deathstar, enterpise A-E, Its a battle between starwars and halo. halo would win though do to more advance shielding tech and the fact that halo can kill any thinking thing within 25000 lightyears.
to clear up some questions: a lightsaber can in fact cut through everything listed (yes, it can cut through the spartans shields) The reason why the forerunners died out was due to the fact that you can "destroy" the flood completley without starving it to death (without a new human body, a infected form would die after its body fell apart (probably due to age)) and thus created halo, the ark, and onyx. after preserving all the living races besides themselves, they activated halo before they could reach onyx do to the flood.
finaly, in a bloody war between all, halo would win hands down. halo would kill them all (except for the forerunners/other halo people who hid in onyx)