Ok i know this thread isn't serious, but WTF is wrong with the guys who think the Lesnars would actually stand a chance?
What is he going to do? Punch the Grizzly? You think that will hurt it? You think he'll be able to take it down? They would all be killed.
If to be serious - I don't give a damn how many bears, tigers, rhynos, elephants, sharks would kill Lesnar while he is barehanded. What I care about is Lesnar beating any professional fighter in the octagon. You don't kill huge beasts with your bare hands so why would Lesnar be an exception when it comes to 1500 lbs Grizzly bear? You kill them with an appropriate rifle and ammo - trust me Lesnar knows how to do that too.
Lesnar would win easily. Bears dont like each other. Bears are solitary animals. Put 10,000 bears together and they would start killing each other. All Lesnar has to do is wait and watch.