Bob Newhart as Dr. Walter Magnus
On NCIS: Dr. Walter Magnus is Ducky's mentor and the former chief medical examiner for NCIS. Though he left the team long ago, he returns to help the team with a difficult case in "Recruited."
Where you may have seen him on CBS: Bob plays Arthur Jeffries on The Big Bang Theory.
Watch Dr. Magnus show off his skills in "Recruited" on CBS All Access.