As far as mash-ups go, I can't say that this is one I expected to see! Marvel Comics has teamed up with Visa to offer Saving the Day, a comic book designed to teach kids about managing money. It features Spider-Man and the Avengers teaming together to fight super villain Mole Man. The comic is cute, and well-drawn, but I was pretty skeptical about a credit card company teaching kids the basics of financial literacy. It's actually well done, though -- they take care to define and describe ideas like budgeting, expenses and interest and keep the credit card talk to a minimum. It's designed for kids in grades 2-7 and fittingly, the information seems like pretty basic, rudimentary stuff.
The comic is available online in English, French, Spanish, Portuguese, Traditional Chinese, Simplified Chinese, Arabic, Russian and Bahasa Indonesia, but it's not clear if they are printing physical copies.