Actor Chris O'Donnell, known for his role in NCIS Los Angeles, also appeared in Grey's Anatomy almost 20 years ago. In Grey's Anatomy, O'Donnell played Dr. Finn Dandridge, a love interest for Meredith Grey. Finn treated Derek Shepherd's dog and asked Meredith out on a date. They went on several dates before Meredith had sex with Derek, ultimately choosing him over Finn. O'Donnell's character in NCIS LA, Agent Callen, had a different love story, marrying Anna Kolchek.