Bravado Men's Dr. Horrible Hammer T-Shirt 100% Cotton Machine wash warm, inside out with like colors, only use non-chlorine bleach, tumble dry low, do not iron decoration Dr horrible's sing-along blog is a 2008 musical tragicomedy short film produced exclusively for internet distribution It tells the story of dr horrible, an aspiring super villain; captain hammer, his nemesis; and penny, their mutual love interest the dvd was released exclusively at amazoncom on december 19, 2008 in the us