In January, 1967, Crumb suddenly left Cleveland. “I escaped to San Francisco when I met two guys in a bar who said they were driving west.” Dana followed him there, and they eventually settled in Haight-Ashbury. Crumb drew “Zap #1” and “Zap #0” in the fall of 1967 and sold them on the street in 1968 (out of Jesse’s baby carriage). So marks the birth of underground comics with Crumb as its most recognizable force. His son Jesse was born at this time, in April, 1968.
Robert continued to draw and travel throughout the rest of the decade.