Third biggest U.S. opening weekend of all time after Dark Knight and Harry Potter and the Deathly Hallows Part 2 . . .
With the movie set to lose up to $136 million, we look at why it flopped . . .
Sci-fi adventure opens behind Lorax animated movie at U.S. box office . . .
Check out some cool concept art and costume designs from the upcoming flick . . .
New poster for big budget Disney flick . . .