As Entertainment Weekly reports, the episode's storyline revolves around online piracy and features Halford singing the band's staple tune "Breaking the Law" to legendary Homer Simpson.
According to the same source, the episode sees Bart teaching Homer how to illegally download movies online, after which he decides to start screening them in his backyard to citizens of Springfield.
"Even though Homer is stealing, he's doing it for the community, he's doing it out of the goodness of his heart," executive producer Matt Selman explained. Finally, the plot is fully stirred up with the appearance of obsessed FBI anti-piracy director.
Titled "Steal This Episode," the new episode is scheduled for airing in January. Apart from Halford, it will also feature guest appearances from Judd Apatow, Will Arnett, Leslie Mann, Paul Rudd, Seth Rogen and Channing Tatum.
As for the metal gods, Judas Priest have announced the completion of their new, yet-untitled studio effort.
"The writing process is complete," Halford told Billboard. "[It's] hard. It's heavy. It's something we think our Priest fans will be thrilled with. We know we have a reputation to maintain, and we know we have to deliver something really strong and solid. The album is going to be full of all the great things you love about Judas Priest."