It's Game 7 of the Galaxy Series.
It's Space Jam on a baseball diamond. The aliens are taking over the world regardless (their weaponry is way stronger because they are light years ahead of us in terms of technology. The only reason we want to win is to avoid total elimination. See, this is kind-of-sort-of realistic).
The aliens set the rules, so they say we need a designated hitter (remember, the aliens are advanced, they've long done away with pitchers hitting). We're allowed two pitchers, eight position players and a designated hitter.
Who do you choose? Remember, this is Earth we're talking about, and more importantly, America. Let's not let our Boston biases get in the way or anything like that.