Bob Newhart

Plan to meet for dessert afterward, but this is a weekend for families to split up among the multiplex auditoriums: There's a 3-D action fantasy for the kids, a rom-com for the ladies, and a gross-out comedy for the guys.

When Bob Newhart decided to do a sitcom after more than a decade of standup comedy, he had one nagging worry:

I may be a  goyische shiksa, but I know from Yiddish.

Bob Newhart's fans have been waiting for this one - his first appearance on The Big Bang Theory Thursday night (May 2).  Duly promoted as befits a sweeps-sized casting coup, Newhart has come aboard TV's highest-rated sitcom for at least three episodes, playing a "Mr. Wizard"- style kiddie science…