Sarah Gilbert and Johnny Galecki's small screen chemistry spans from ''Roseanne'' to ''Big Bang Theory'' and back again. Tuesday night's episode of ''Roseanne'' saw the return of David and Darlene.

Johnny Galecki rose to fame with roles in Roseanne, The Big Bang Theory and more - but he has since stepped back from acting. After appearing in theater productions as a child, Galecki made his ...

Apparently, "Big Bang Theory" stars Johnny Galecki and Simon Helberg, who played friends and California Institute of Technology colleagues on the series from start to finish, didn't think about ...

Johnny Galecki rose to fame with roles in Roseanne, The Big Bang Theory and more — but he has since stepped back from acting. After appearing in theater productions as a child, Galecki made his ...