Starting May 3, 2021, Anthrax counted down the days to their official July 18 anniversary, first with a three-times-a-week, 40-episode, guest-filled web series that included testimonials from friends such as Chuck D, Kerry King, John Carpenter, Slash, Tom Morello, Rob Zombie, Robert Trujillo, Dave Grohl, Keanu Reeves, and many more.