David McCallum almost didn’t get cast as Ducky on NCIS, but decades later, he became one of the show’s most beloved ...

Producer Don Bellisario understood this formula and bet on it during the casting process, especially when choosing David McCallum for the role of Donald Mallard, also known to his colleagues as Dr.

returned ten years after leaving the crime series. Wilmer Valderrama stars on NCIS now, but his famous That '70s Show role is ...