magellan33 said: "You can only do so much when the two stars of the show can only be seen by one fellow cast member."
I assume, then, that you never heard of "Topper".
Which, in addition to the two stars who could only be seen by one member of the cast, had a dog, ditto.
This was the kind of program that had "Not Gonna Make It" written allover it from the first episode - it was like an arcade video game where you actually have to read the instructions to play; no-one (well, very few of us, apparently) wants to watch a comedy program that has a basic premise that actually requires *thought* to grasp.