Summer Blockbusters: Sci-fi and Alternate History

It seems the past has replaced the future as Hollywood's preferred setting for summer's science fiction blockbusters. Jon Favreau's screen adaptation of the graphic novel, Cowboys and Aliens imagines an extraterrestrial invasion of the Old West. X-Men: First Class offers a prequel to the popular franchise, tracing Magneto and Charles Xavier's education and upbringing and (of course) crucial involvement in the Cuban Missile Crisis.

[Image credit: Wikipedia]