Which Summer Movie Will Be The Biggest Surprise Flop?S

Some of the biggest icons in science fiction are battling for your dollars this summer, including Star Trek, Terminator and Transformers. Who's going to lose?

Note: As with last year's similar poll, I'm not listing every summer movie. Just the ones which seem to have a high expectation of making bucketloads of your money. Which of these movies will have a shocking shortfall?