Whatever Happened to Billy Whatsisname?

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.

Billy hält Mandy für undankbar und verlässt sie. Doch Mandy findet schneller Ersatz als ihm lieb ist.

Billy è stufo dei maltrattamenti di Mandy, così decide di non rivolgerle più la parola. Il giorno dopo, Mandy decide di fare la stessa cosa, inoltre recluta un nuovo amico di nome Bobby, il quale è molto simile a Billy.