According to Ain't It Cool News, heavy metal legend Ronnie James Dio (RAINBOW, BLACK SABBATH, DIO) has signed on to appear in the upcoming TENACIOUS D movie, "Tenacious D: In the Pick of Destiny". The film will be directed by Liam Lynch, who also directed the video for "Tribute" and the clips shown at the D's concerts ("Butt Baby", "JB's BJ", and "Rock Star Sperm Bank"), reports TenaciousJoes.com. The film is being produced by TENACIOUS D star Jack Black's longtime colaborator Ben Stiller's Red Hour Films and Working Title Films, which produced "High Fidelity". The first draft of the script was written by Scott Aukerman and B.J. Porter, who were also writers for the HBO show. However, after careful consideration the D decided that only they could capture the true escence of the D. So Jack Black, Kyle Gass and Liam Lynch all sat down together and began writting. Six movie treatments later, they finally finished their masterpiece.

According to Liam, "It's going to shake the pillars of hell with it's radness," but when asked of the details of the plot, Liam would only say that it is a secret that "no mortal could handle the thought of." However, he has revealed two things: one, that the film will tell the story of how the D came to be, and two, that the film will showcase brand new songs from the D! The soundtrack to the movie is very likely to be the follow-up to the D's first album.

The executive producers of the HBO show (Bob Odenkirk and David Cross) will be involved in the movie, and it has also been confirmed that the D's right hand man and "webmaster" Lee will have a role in the film. So far it is rumored that MEAT LOAF will be playing Jack Black's father, Jack Black will be playing his own mother, and Will Ferrell will be playing a music-shop dude.