All of his life Ken Jeong had only one goal in life: to make good grades and become a physician. While he admits he was a nerd — a popular nerd — he kept that ambition close to his heart.

Then something went terribly wrong. Oh, he achieved his goal all right. He became a physician in internal medicine employed with an HMO in L.A. But he discovered that he could best “do no harm” by making people laugh.

That’s the circuitous way that Jeong finds himself the star of his own sitcom, “Dr. Ken,” premiering on ABC Friday. The costar of the “Hangover” movies and the TV series “Community” says he never intended to give up his day job.

“I kind of discovered theater in college. I discovered everything late in life so I wasn’t the class clown or anything like that,” he says, seated at a marble-topped table in a coffee bar here.

“I loved a good laugh but I think, in a way, being a late bloomer helped me because when I was a kid, I was just trying to get into college and to get good grades. That’s all I cared about. I didn’t have any ambitions in high school to do this whatsoever.”

Jeong was felled by the acting virus during his last days of high school. “There was this little performance piece, and I was asked to do it, and kind of stole scenes in that. I just didn’t know I had a knack for it like that . I just kind of scratched that itch in college. One thing led to another and led to standup, led to acting - all the while I still felt it was a hobby. My goal was to be a physician and to still do this.”

But fate kept interrupting his carefully constructed plan. “It was one of those things that your passion side-project became your full-time job,” says Jeong, who’s wearing a navy-blue suit and a pale lavender shirt, open at the collar. “Still there’s a side of me - like 10 years ago I was doing standup on the side, and I was very happy doing that. I was working at an HMO and my wife’s a doctor, all my good friends are doctors. So I was happy then. I’m much happier now.”

Most actors can pinpoint the grim times of their ascent to prominence. Not Jeong. For him it was a sure and steady climb in show business, his antics stealing almost every scene he was in.

But life threw him a challenge far more wrenching than his erratic job. His wife, Tran, was diagnosed with breast cancer when their twin girls were just a year old. Their extended family rallied to the cause and fortunately she has been cancer-free for seven years and still works in family practice.

In fact, it was Tran who encouraged him to forsake his steady job for the far more quixotic laugh factory. “It was scary to quit my day job,” he admits. “I wasn’t sure I could make it. I said, ‘Well, if it doesn’t work out I could go back in some shape or form.’ I do remember thinking, ‘I don’t know if this will work out.’ But I was really happy when I finally committed to it,” he says.

“Entertainment is so fickle,” he shakes his head, “and you just don’t know. But at the same time, it’s very clarifying because knowing that no job lasts forever, it’s a lot like life. Just enjoy it while you can. Make the most out of every job. So whether I’m doing something like ‘Dr. Ken,’ I want to enjoy every second of it. I want this to be as fulfilling as possible. And that’s kind of how one should look at life.

“I’m not talking about MY day job, but when someone feels stuck, in a rut in their day job - even if you’re making a good living; it’s the same old crap every day. What’s the joy in that? Do you come home just to be miserable and everything’s really a depressing version of ‘Groundhog Day?’ So I’m spared of that,” says Jeong, who has given up standup for acting.

“I think part of me craves stability and part of me craves excitement. I’m just trying to have a balanced view of it. I think you’re doing humanity a disservice if you’re not doing what you love to do. It’s bigger than that. I still keep in contact with patients and still have my license to practice. My wife’s a doctor and I think the last thing you want is a doctor to take care of you who doesn’t want to do it.”

‘Code Black’

If CBS’s new drama “Code Black” seems graphically real, that’s because part of it is. The term “code black” is the phrase used in emergency rooms when the patient count overloads the staff. And the series, premiering Wednesday and starring Marcia Gay Harden, rumbles with that kind of authenticity. “The world feels very handmade, made by people to serve people,” says executive producer and show runner Michael Seitzman.( “That was kind of the key to how to tell the story, to light it naturally, to not worry if somebody falls into darkness, to create a code black and then put three cameras in the middle of it and shoot it. We hired 30 real trauma nurses who work both off-screen and on-screen,” he says.

“And we Taft Hartley’d them . meaning we got them into SAG (Screen Actors Guild) and they can speak. We tell them, ‘Treat your patient. This is your patient. This is what’s wrong with your patient. Say what you would say. Do what you would do.’ And we’re going to fit our drama in and over and around that . What we end up with is something that feels incredibly authentic and incredibly real and doesn’t really feel like anything else, nothing that I’ve ever seen before. It’s also electrifying to make.”

‘Grandfathered’

John Stamos wanted to break out of the usual “hot guy” roles he’s been playing, and was searching for a juicy a villain to portray when the opportunity arose for him to star in Fox’s new sitcom, “Grandfathered.” “I was actively looking for a show, but something a little edgier,” says Stamos.

“I wanted to play a bad guy. And my agent was like, ‘Why don’t you just do what you do well, and play in your wheelhouse?’ I was, like, ‘That makes sense.’

“And then Danny (executive producer Dan Fogelman) and I met the next morning for breakfast and he said, ‘I have an idea where it’s sort of an unconventional family show where you play kind of swinging dude, a George Clooney before he turned against everything he believed in and got married.’

“So I can relate to that a little bit. And all of a sudden I find out that I have a son. I said, ‘That’s a great idea.’ But I did that with Jack Klugman, a show called “You Again,” where I was the son.’ He said, ‘Well, I have one little twist.’ And he was sort of reticent to say it. He said, ‘What if you’re a grandfather?’ And I said, ‘Yes, that’s it.”’ So that’s sort of how it came about. And I’m happy to be a part of it.” Meanwhile his villain will have to wait. “Grandfathered,” airs Tuesdays.

‘Narcos’

It was a good try on the part of Netflix to create the story of drug potentate Pablo Escobar and the forces that took him down. The show, “Narcos,” which is streaming now, chronicles two parallel tales.

Executive producer Jose Padilha explains, “(It’s) a Colombian story of this entrepreneur drug dealer who gets incredibly rich, incredibly powerful, and has political ambition. So it’s a bigger-than-life story of a character. This is one team of the series. The other team is America, the flip side of this coin — because all the money that was going into cocaine to Colombia corresponds into cocaine going into America. And it created havoc in Miami first.

“People were dying in Miami like they die today in Rio de Janeiro. They’re shooting each other. And that story, how cocaine hit America and how it brought violence to America, can only be narrated from the American perspective.”