PAX East 2011 video game convention scenes
Carli Velocci Photo for Boston.com
Ethan Gilsdorf is the author of "Fantasy Freaks and Gaming Geeks: An Epic Quest for Reality Among Role Players, Online Gamers, and Other Dwellers of Imaginary Realms," now in paperback. Follow his adventures at www.ethangilsdorf.com.
Chris Brown, 21, dressed up as Doctor Horrible from the Joss Whedon online mini-series "Doctor Horrible's Sing-Along Blog."