Halo, Mass Effect 3, Team Fortress 2…a killer all-star gaming mash-up (video)

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If gamers could dream up their fantasy all-star multiplayer game, a live-action version would probably end up looking like this, with a mash-up of Halo, Team Fortress 2, Mass Effect 3, and a surprise guest at the end:

(Special thanks to Michael Donahoe for the tip!)