By 2004 Tommy Blacha moved onto new projects, becoming a writer on Andy Richter Controls the Universe, Da Ali G Show and head writer for Late World with Zach and The Orlando Jones Show. During this time, he met Brendon Small and began developing the concept for Metalocalypse which was picked up by Adult Swim in 2005 and was first aired in August 2006. In the show he voices the characters of Toki Wartooth, William Murderface, Dr. Rockso and many others. He co-wrote, alongside Brendan Small, every episode of the first and second seasons of the show, and directed the episodes "Dethstars" and "Dethgov". For the third and fourth seasons, he left the production of the show but still returned to voice his characters.