Director/a
Joss Whedon
DIRECTOR/A
Reparto (por orden de créditos)
Neil Patrick Harris
Billy (Dr. Horrible)
Nathan Fillion
Captain Hammer
Felicia Day
Penny
Simon Helberg
Moist
Nick Towne
Bad Horse Chorus #1
Jed Whedon
Bad Horse Chorus #2
Rob Reinis
Bad Horse Chorus #3
Otto Michael Penzato
Driver
Richard Partlow
Mayor
Maurissa Tancharoen
Groupie #1
Stacy Shirk
Groupie #2
Steve Berg
Groupie #3
David Fury
Newsman
Marti Noxon
Newswoman
Michael Boretz
Other Moving Guy
Lance W. Lanfear
Hawaiian Shirt Guy
Michael G. Canaan
Pink Pummeler
Jonathan Reilly
Purple Pimp
Douglas Petrie
Professor Normal
Drew Goddard
Fake Thomas Jefferson
Kate Danson
Tie-Die
Liz Vassey
Fury Leika
Athena Demos
Snake Bite
Dobber
Bad Horse
Dr. Horrible's Sing Along Blog
Mayor Hankins
Norma Jean
Helping Hands Volunteer(uncredited)
Heather Black
Unfeeling Woman(uncredited)