Name: The Making of Dr. Horrible's Sing-Along Blog
Cast: Felicia Day, Nathan Fillion, Neil Patrick Harris, Simon Helberg, Maurissa Tancharoen

Felicia Day

(Herself)

Nathan Fillion

(Himself)

Neil Patrick Harris

(Himself)

Simon Helberg

(Himself)

Maurissa Tancharoen

(Herself)

Jed Whedon

(Himself)

Joss Whedon

(Himself)

Zack Whedon

(Himself)