You will Watch The Grim Adventures Of Billy and Mandy Season 3 Episode 14 online for free episodes with HQ / high quality. Stream cartoons The Grim Adventures Of Billy and Mandy Episode 37 Whatever Happened to Billy Whatishisname?: When Billy and Mandy have a brief fight, Billy says he never wants to speak to Mandy again. The next day, Billy is over his grudge, but Mandy has already decided to find a replacement for him. Later, Mandy introduces Bobby, the new “Billy”, who turns out to be a better friend than Billy, even gaining the affection of his parents, but who also wants to take over Billy’s life. In the end, a jealous Billy uses Grim’s scythe to open a portal and send Bobby to another dimension.