Galecki confirmed the news with an Instagram post on Friday, calling his return “maybe the most surreal experience of my life”:
Galecki’s return was first revealed by executive producer Whitney Cummings, who on Thursday night posted an Instagram story featuring the actor’s set chair, with his name printed in the same font as the original show logo.
It is unclear if Galecki is appearing in one or more episodes of Roseanne, which is just two weeks shy of completing production on its nine-episode order. His starring role on CBS’ The Big Bang Theory led to skepticism about his ability to participate at all — but that didn’t stop the revival from casting Darlene and David’s two children: teenage daughter Harris (Shameless‘ Emma Kenney) and eight-year-old son Mark (newcomer Ames McNamara).
Galecki first turned up on Roseanne during Season 4 — not as David, but as Kevin. The character’s name was changed to David in subsequent episodes. He quickly went on to become a series regular, staying with the show until its series finale in 1997.