 He was her mentor and believed that she was a great agent; in "Sub Rosa", Gibbs brought Todd with him aboard a U.S. Navy attack submarine even though women are considered "problematic" aboard submarines; in order to bring Todd with him, Gibbs didn't hesitate to argue with Norfolk's sub squadron commander.Keeping with his tendency to know "everything about everyone", Gibbs knew what the tattoo Todd had on her back represented and was apparently the first to identify Dr. Rachel Cranston as Todd's sister in "A Man Walks Into a Bar...".Confronted with Todd's death, a shocked and vengeful Gibbs found himself overwhelmed with guilt and, like the rest of the protagonists, began having visions of her.