Question: When did johnny galecki first appear on roseanne?
Disambiguated questions and answers: question: Which episode did johnny galecki first appear on roseanne?
When was the episode where johnny galecki first appeared on roseanne?
answer: 86
episode 4.14
4.14
The Bowling Show
January 21, 1992
Natural Questions answer: 1992 (from the Wikipedia article "Johnny Galecki")