"The Big Bang Theory" (8 p.m., CBS 3) doesn't need big guest stars to draw a crowd, but that doesn't mean Bob Newhart's appearance as the guys' childhood idol, "Professor Proton," isn't an event.
Watching Jim Parsons (Sheldon) with the star of "The Bob Newhart Show" and "Newhart" had me laughing harder than I have at anything on TV in a while (and was reportedly a thrill for those members of the cast who grew up watching Newhart).
You can read my interview with the legendary comedian here.
You may also want to check out:
-- "Parks and Recreation" (9:31 p.m., NBC10). Hard to believe it's been a year since Leslie Knope (Amy Poehler) became a city councilwoman, but the Season 5 finale finds her celebrating. Let's hope there'll be more to celebrate when NBC unveils its fall schedule later this month, since "Parks and Rec" still hasn't been renewed.
-- "Zach Stone Is Gonna Be Famous" (10:30 p.m., MTV). The network's newest scripted series stars Bo Burnham, who co-created (and writes and directs) this story about a recent high school graduate who decides to forgo college to launch his own "reality" show. (And if that sounds too much like real life, there's always "Scandal" -- 10 p.m., 6 ABC -- where the president's in trouble. Again.)