Peter Gallagher has appeared in two episodes from Season 18 of "Grey's Anatomy," starring as Dr. David Hamilton. David is a surgeon who knew Meredith Grey's (Ellen Pompeo) mother, Ellis (Kate Burton), while she was alive. He invites Meredith out to his home in Minnesota, where a research library is being dedicated to Ellis, and then asks Meredith to join him on a promising new research project to find a cure to Parkinson's disease. However, Meredith is unwilling to leave Grey Sloan, but she and David eventually agree that she can carry out most of her research in Seattle and travel to Minnesota weekly.
This exciting new story arc might mean we get to see more of Gallagher on "Grey's." He's only slated to appear in two episodes of Season 18, according to IMDb, but with an actor as popular as Gallagher joining the hit show, we imagine Dr. David Hamilton might end up playing a bigger role than expected.
