Conversation so far:
What was Dragnet with Jack Webb about?
Dragnet was a recurring series based on real cases from LAPD police files, featuring authentic depictions of the modern police detective, including methods, mannerisms, and technical language.
What role did Jack Webb play in Dragnet
Jack Webb played Sgt. Joe Friday in Dragnet

Question: What did Joe Friday do in Dragnet?
Self-contained rewrite: What did Joe Friday do in Dragnet?