Conversation so far:
Why did Superstar Billy Graham return to the WWWF?
an agreement with promoter Vincent J.
McMahon (Senior.
What was his agreement with McMahon?
CANNOTANSWER.
How did people respond to his return?
CANNOTANSWER.

Question: What else happened during 1977-1981?
Self-contained rewrite: What else happened during 1977-1981 other than Superstar Billy Graham's return?