used to be sequelses, that was a dirty word. >> reporter: in the first quarter of this year, box office revenues were down 20%. so, hollywood needs blockbusters right now. this summer, they may have them. "hangover ii," biggest opening ever for a comedy, earning nearly $86 million. "transformers 3," forecast to earn $460 million world wide. "pirates of the caribbean 4," $795 million and counting. the biggest of them all is expected to be "harry potter." >> that's a recipe for success. >> reporter: there's nothing new. >> hey, audiences want to know what they're spending their money on. they know jack sparrow is in this movie. they're going to reach in for their 12 bucks, maybe 15. you can't blame it all on hollywood. >> reporter: summer is the time for super heros. this summer, there's thor, captain america and -- >> brightest day and blackest night. >> reporter: green lantern. as super heroes go, these might well be considered scene stealers. >> i don't know how many people know green lantern. but ryan reynolds is in it, they know him. >> reporter: going to the bottom end of the superh