The Big Bang Theory's Johnny Galecki (Leonard) initially gained fame as David Healy on the "Roseanee" sitcom.  Galecki will make an appearance in the reboot, according to etonline. The series' star Roseanne Barr tweeted she's ecstatic about his return, “We have got our Johnny Galecki back on ‘Roseanne' this episode - what a joy to work with such a deeply empathetic actor.” Sara Gilbert will reportedly reprise her role as his onscreen wife, Darlene. The new series makes its debut in 2018.

[etonline]