One new TV show with a built-in audience is “Joey,” where Matt LeBlanc reprises his “Friends” role of Joey Tribbiani, moving all the way from New York to Los Angeles without changing a time slot.

But the big question is: Will Joey Tribbiani’s middle name be “Frasier” or “Phyllis”?

Some characters pop out of ensemble shows and thrive, such as in “Frasier” and “Laverne & Shirley.” Others stagger — to put it mildly — such as in “Phyllis” and “After MASH.”

Which category “Joey” falls into will depend less on LeBlanc than on the people around him. Will his show be stuck with second-tier writers? Will the characters around him be as distinctive as Roz and the Cranes — or even Lenny and Squiggy?

Even the best actor can’t carry a show alone. Such legends as Lucille Ball and Mary Tyler Moore have had flops. Sometimes premises and chemistry don’t work, and it shows.

Keep that in mind whenever you are tempted to change workplaces. Ask yourself these three questions:

— Do you really want to be the star? Top workers put in longer hours and run greater risks, but also have the potential for greater rewards. Many people don’t have the combination of dedication, talent and ambition to make it. Make sure the goal is something you’re passionate about before you take risks.

— Do you have the depth of skills? Even on “Cheers,” Frasier Crane’s character had texture — warmth, insecurity, pompousness — that made him potentially more than a role player. On the other hand, the title character in “Phyllis” was much more one-dimensional.

— How good is the supporting cast? If yours is potentially weak, make sure you have the power to change it dramatically. Otherwise, your reputation will be dragged down rather than built up.