The below description is taken from LEGO.com.
Fall Out Boy Milhouse
Sidekick to the superhero Radioactive Man, Fallout Boy is much less powerful (and slightly less radioactive) than his mighty mentor. And when it comes to being ineffectual, nobody’s more effective than Milhouse! That’s why he’s the perfect fit to play Fallout Boy in the big-screen movie based on Bart and Milhouse’s favorite comic book. Will fame and fortune change our young hero? Probably…but you can bet he’ll be back to normal by next week!