the episode where johnny galecki first appeared on roseanne was on january 21, 1992.
the episode where johnny galecki first appeared on roseanne was on january 21, 1992.
when was the episode where johnny galecki first appeared on roseanne?
january 21, 1992
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johnny galecki









































john mark galecki (born april 30, 1975) is an american actor. he played leonard hofstadter in the cbs sitcom "the big bang theory" (2007–2019) and david healy in the abc sitcom "roseanne" (1992–1997; 2018). 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).
johnny galecki