He is best known for voicing Space Ghost on the adult swim program Space Ghost : Coast to Coast . He also voices Brak 's Dad on The Brak Show . In addition to Space Ghost Coast to Coast and its spin-off program Cartoon Planet , Lowe has made appearances as Space Ghost in Aqua Teen Hunger Force Colon Movie Film For Theaters , The Brak Show ( he was also a series regular , providing the voice for Dad ) , Robot Chicken ( among various other characters ) , Perfect Hair Forever , and other Adult Swim series .