Before Joss Whedon recently hooked up (again) with Marvel to helm and rewrite The Avengers film, he shot a 42-minute short film called Dr. Horrible’s Sing-Along Blog which is coming to Blu-ray on May 25.

Dr. Horrible’s Sing-Along Blog stars Neil Patrick Harris (How I Met Your Mother) as a super villain having trouble finding success in conquering the world or winning the girl (Felicia Day). Standing in his way is Nathan Fillion (Firefly, Castle), a dashing hero who has his eyes on the same girl.

Dr. Horrible’s Sing-Along Blog will arrive on Blu-ray in 1.33:1 1080p video and 2.0 Dolby Digital audio. Over 90 minutes of bonus features will include the following:

Commentary with the cast and creators

“Commentary! The Musical”: 42 minutes of all new music where the cast and creators ignore the movie and sing about the writers’ strike… and each other

Behind-the-scenes featurettes on the making of the movie and the music

The top 10 video applications submitted by fans who want to join the Evil League of Evil

Three Easter eggs: blooper reel, rehearsal footage, and up-close-and-personal interviews with the members of the Evil League of Evil

Click here to pre-order Dr. Horrible’s Sing-Along Blog on Blu-ray for $13.99 at Amazon.com.