It will surprise no one to learn that the creators of Fluble were hopelessly inept. Perhaps the most glaring evidence of this is Rubble. Originally genetically identical to Fluble, Rubble E. Marshell's life was forever ruined when he was accidentally infused with Pure Evil, making him that most agonizing of tired plot devices: the evil twin. Rubble has never forgotten the condition that cruelly forces him to dress completely in black, make appearances only when accompanied by an evil scheme, and - worst of all - always be known as the botched copy of his older, less morally-objectionable brother.

Realizing that he can never have an identity of his own until Fluble, the template upon which he was based, is destroyed, Rubble has set out to eliminate Fluble and take his place. The adopted son of Bob, Lord of Hell, Rubble has grown skilled in the Black Arts, and intends to use them to bring about his glorious victory. This may take some doing, since the Black Arts are apparently the same as the Pastry Arts, which Rubble could have learned just as easily at Onondaga County Community College as he could in the bowels of Perdition.

Besides the wearing all black, Rubble has a smooth, sinister, undeniably cool British accent, which drives the chicks wild. He also recently acquired a discolored right eye. Despite these divergences from Fluble's appearance, people still don't care about him all that much.