Peter Wolfe is Heffer's adoptive brother. His voice is a deeper, more masculine version of his sister Cindy's and, also like Cindy, he parodies the stereotypical rebellious teenage behavior. He was primarily used for a background character, but would later become part of long-running but rarely seen gag that implies that he is a cross-dresser, such as being a cheerleader (though he previously dropped out of high school). His name is a reference to the musical story Peter and the Wolf. Peter is voiced by Mr. Lawrence.