This is sort of a fan's response to Dr. Horrible. In it, the fan dressed as "Dr. Dreadful" applies to be Dr. Horrible's sidekick. Made da Mark Andrich.
"Dr. Blog-Bot of DoctorHorrible.net, a fan site dedicated to Dr. Horrible's Sing-Along Blog discusses how fan reacted to issues during the Joss Whedon web series debut and how the faithful have taken to it since."