You will Watch The Grim Adventures Of Billy and Mandy Season 7 Episode 3 online for free episodes with HQ / high quality. Stream cartoons The Grim Adventures Of Billy and Mandy Episode 76 Billy Gets an “A”: When Billy fails an important test, the result of which will go into his permanent record, he asks Grim to magically alter his grade from an “F” to an “A”; as Grim reluctantly changes the grade, Billy becomes a genius, but reality is thrown completely off balance. Then, Mandy and Grim go back in time to stop the past Grim from helping Billy, but it doesn’t work. They keep going back in time to different epochs, each time meeting another Grim, eventually trying to stop Billy’s ancestors from conceiving him, but nothing works. After meeting Billy’s distant dinosaur relative, the episode ends abruptly as Grim wonders what the end of this could be.