The making of 'Dr. Horrible's Sing-Along Blog'.
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The making of 'Dr. Horrible's Sing-Along Blog'.
| Actor | Role |
|---|---|
 Felicia DaySelf | Self |
 Nathan FillionSelf | Self |
 Neil Patrick HarrisSelf | Self |
 Simon HelbergSelf | Self |
 Maurissa TancharoenSelf | Self |
 Jed WhedonSelf | Self |
 Joss WhedonSelf | Self |
 Zack WhedonSelf | Self |