"Who would you enlist to battle an alien invasion: the Hulk, Batman or Spider-Man?

First off, the answer is Batman. The answer is always Batman. If the Hulk is really the best choice, as 21 percent of Americans seem to think, then Batman will realize that and fetch the Hulk.

The problem with the Hulk is that he is motivated mostly by resentment, anger and whim, so you’d need a very intelligent, well-prepared and psychologically manipulative Hulk-handler. Which is to say, Batman.

Assuming Superman is excluded because he actually is a space alien, my second choice is Katniss Everdeen, and my third choice is Finn and Jake."

The answer is ALWAYS Batman. Excellent answer!

Agreed that Superman is likely better with aliens.

Katniss is an inspired choice. :)