Conversation so far:
who does the voice of the cookie monster
The Cookie Monster was voiced by Frank Oz until 2004, and presently by David Rudman.
what are some of cookie monster's catch phrases
Cookie Monster's famous eating phrases are Me want cookie!, Me eat cookie!, and Om nom nom nom.
does cookie monster have a family
Cookie Monster is known to have a mother, a younger sister, and an identically-designed cousin, who ironically does not like cookies.
do cookie monster's mom and dad like cookies
Both Cookie Monster's mother and father share his enormous appetite and craving for cookies.

Question: when did the character first appear in the show
Self-contained rewrite: when did cookie monster first appear in sesame street