For the Grim Adventures of Billy and Mandy character, see Billy(B&M).


Billy is a little kid that Megacorp used to advertise a commercial to show the Protopet.thumb|294px|right|The ad. At the end of season 3 after Dr.Nefarious's defeat he attended Secert Agent Clank film and sitting by Abercrombie Fizzwidget and the Original Protopet.

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