when did johnny galecki first appear on roseanne
Johnny Galecki John Mark Galecki (born April 30, 1975)[1] is an American actor. He is known for playing Leonard Hofstadter in the CBS sitcom The Big Bang Theory since 2007 and David Healy in the ABC sitcom Roseanne from 1992 to 1997 and briefly reprised the role during its 2018 revival. Galecki also appeared in the films National Lampoon's Christmas Vacation (1989), Prancer (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), In Time (2011), and Rings (2017).
Sara Gilbert Sara Gilbert (born Sara Rebecca Abeles; January 29, 1975) is an American actress, best known for her role as Darlene Conner on the ABC sitcom Roseanne from 1988 to 1997, for which she received two Primetime Emmy Award nominations.[1] Gilbert reprised the role in 2018 for a nine episode revival. She is also co-host and creator of the CBS daytime talk show The Talk and has had a recurring role as Leslie Winkle on CBS's The Big Bang Theory.