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You are able to buy "Dr. Horrible's Sing-Along Blog" on Apple TV as download.
There are no options to watch Dr. Horrible's Sing-Along Blog for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when show is available to watch for free on streaming services and TV.
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Aspiring super-villain Dr. Horrible wants to join the Evil League of Evil and win the girl of his dreams, but his nemesis, Captain Hammer, stops him at every turn.