Summer comic blockbusters collide as Iron Man Tony Stark, played by Robert Downey Jr., pops up in the new Incredible Hulk movie. Geeks, prepare to clean up after yourself.

So you saw Ang Lee's "The Hulk" and have tried desperately to forgot the long, tedious anti-popcorn flick, thinking you know all there is about the green goliath. Well, Edward Norton and Marvel Comics want you to think again,...