Bob Newhart's recent appearance on NCIS (episode: "Recruited") has the actor moving and speaking a little slower (he even needs help down a flight of stairs at one point), but it's entirely appropriate to the character, and besides, when ol' Bob delivers a clever line that ends on a smile, we realize he's still got it.
Newhart guests as Dr. Walter Magnus, the predecessor and mentor to the show's regular forensic coroner, Dr. Mallard (David McCallum).
I don't mean for the above to sound so negative about what was a great opportunity for the comedic Newhart to give an emotionally moving performance (so perhaps I'm just bummed that, given Dr. Magnus' condition, we shouldn't expect a repeat appearance of the character).
The episode has some early dialogue about a "country inn" in Vermont (shades of NEWHART, anyone?), leading the viewer to think the story will perhaps be loaded with in-jokes. That's not the case, because when Newhart's character dials up a chinese take-out place, he doesn't even utter the words "moo goo gai pan" (fans of THE BOB NEWHART SHOW will know which famous bit I'm referencing!). --Mike Malloy