The web phenomenon Dr. Horrible’s Sing-Along Blog is coming to Blu-ray on May 25th.

Dr. Horrible, starting Neil Patrick Harris as the titular character, Nathan Fillion as his arch-nemisis Captain Hammer, and Felicia Day as his crush Penny, was created by Joss Whedon (of Buffy the Vampire Slayer, Angel, Firefly, and Serenity fame) during the 2008 Writers’ Strike.

The Blu-ray disk will retail for $19.95 and will feature the entire 42-minute series as well as 92 minutes of special features.  The special features include:

• Commentary with cast & creator Joss Whedon
• Audience favorite “Commentary! The Musical” where they don’t talk about the movie at all and instead talk about the Writers’ strike and how they’re better than one another in some way
• Behind-the-scenes featurettes on the creation of the story line and musical numbers
• Video applications to the Evil League of Evil, submitted by fans
• Blooper reel
• Rehearsal footage
• Interviews with members of the Evil League of Evil

Neil Patrick Harris will also appear on the hit FOX show Glee sometime this season, an episode that Joss Whedon directed. Whedon, usually famous for his twisted plots (that aren’t always happy endings), is a fan of the show. Glee executive producer and co-creator Brad Falchuck called Whedon a genius, explaining “There’s a reason why that guy is as well known and as well respected as he is.”

So I’m looking over the tech blogs I visit on a daily basis and I run into a story about Joss Whedon. Yeah, that Joss Whedon…the guy that gave Buffy the Vampire Slayer a life and let us join in on the fun times the crew of the Firefly were having. Now Joss has gone back and made a musical unlike any other musical ever created. Yes, you heard me correctly….JOSS WHEDON MADE A MUSICAL.  I know that a few of you are now muttering to yourself that I have no clue that Joss had done a musical prior to this as an episode of BTVS. You’d be wrong.  See, I just noted that I know what he did when I said you’d be saying I had no clue.  See, my mind does work in it’s own wonders at times.

This musical is called ”Dr Horrible’s Sing-Along Blog” and is about a mad genius, Dr Horrible, that wants to join the Evil League of Evil as well as get to know the girl he sees at the local Laundromat during the week. His nemesis is Captain Hammer, the do-gooder of all do-goodiness. This three-part epic will be available online for FREE up to midnight, July 20th. You can get it on iTunes for a very good season pass of $3.99 and watch it from now to eternity on your Apple TV, iTunes, or iPod/iPhone.  A DVD will be out sometime this fall, look for the announcement from Comic-con sometime in the next week.

So who stars in this tour-deforce of a musical? I’ll tell ya so listen closely. Dr Horrible is played by Neil Patrick Harris (Doggie Houser), Captain Hammer is played by Nathan Fillion (Mal on Firefly), and the lady that Dr H is interested in, Penny, is played by Felicia Day (Vi on BTVS in 2003).

Click on over to www.DrHorrible.com and enjoy the musical fun that is “Dr Horrible’s Sing-Along Blog.”