NBC loved having their stars appear on the daytime game shows in general. With the exception of "Squares" and any other celeb shows, there are lots of instances of net stars doing a walk-on to plug their shows, even on "J!" (although with the contestants no doubt silently fuming at two minutes of game time being taken away for Art Fleming glad-handing some third-billed star of a bomb sitcom). Nothing pops out right now, except for the British entertainer Des O'Connor, who was the summer replacement for the "Kraft Music Hall" for many years with a show produced by ATV and shot at Elstree, doing his "I Say I Say" bit with Bob Clayton on "Concentration." (For those who don't remember, this music hall bit had O'Connor ready to give some sort of recitation and forever being interrupted with an "I Say, I Say" by various persons with cornball jokes.)
