1 Ishmael: But if you don’t want to conquer Earth, why do you want to hang out here?
2 Martian 1: We’re the last Martians. The rest of our species died out centuries ago.
3 Ishmael: You have a whole planet to yourselves! You could hang out there.
4 Martian 1: But who would make TV shows for us?
4 Martian 2: And the popcorn?

I think one thing we've truly discovered about the Martians since the start of this theme is that they really like junk food.