Conversation so far:
What is Zap relative to Robert Crumb?
Independent publisher Don Donahue invited Robert Crumb to make a comic book; Crumb drew up two issues of Zap Comix, and Donahue published the first in February 1968.
What is significant about Robert Crumb's Zap Comix?
Robert Crumb had difficulty at first finding retailers who would stock it, and at first his wife took to selling the first run herself out of a baby carriage.
Were Zap Comix by Robert Crumb successful?
Zap Comix by Robert Crumb was financially successful, and developed a market for underground comix.
What happened after Zap Comix by Robert Crumb was financially successful?
Robert Crumb was a prolific cartoonist in the late 1960s and early 1970s.
What did Robert Crumb do with S. Clay Wilson?
Robert Crumb met cartoonist S. Clay Wilson, an art school graduate who saw himself as a rebel against middle-class American values and whose comics were violent and grotesque.
What did Robert Crumb do with the information that cartoonist S. Clay Wilson was an art school graduate who saw himself as a rebel against middle-class American values and whose comics were violent and grotesque?
S. Clay Wilson's attitude inspired Robert Crumb to give up the idea of the cartoonist-as-entertainer and to focus on comics as open, uncensored self-expression.
What happened after Robert Crumb was inspired by S. Clay Wilson's attitude to give up the idea of the cartoonist-as-entertainer and to focus on comics as open, uncensored self-expression?
In particular, Robert Crumb's work soon became sexually explicit, as in the pornographic Snatch he and S. Clay Wilson produced late in 1968.
Is there anything interesting about the underground comix relative to Robert Crumb besides what is mentioned previously?
The second issue of Zap Comix by Robert Crumb appeared in June. In December, Don Donahue published the still-unreleased issue as #0 and a new third issue.
Were the second, #0, and third issues of Zap Comix by Robert Crumb successful?
Zap Comix by Robert Crumb was financially successful, and developed a market for underground comix.
What were some of Robert Crumb's achievements?
Robert Crumb produced much of his best-known work in the late 1960s and early 1970s, including strips featuring characters such as Fritz the Cat, Mr. Natural, and Angelfood McSpade.

Question: What other characters were involved?
Self-contained rewrite: What other characters were involved in Robert Crumb's best-known work besides Fritz the Cat, Mr. Natural, and Angelfood McSpade?