Read an exclusive excerpt from an upcoming book about the hit series.

Can you imagine watching a version ofThe Big Bang Theorywhere Shamy doesn’t exist?

Read an exclusive excerpt from the book below:

Cuoco and Galecki would soon have even more to celebrate.

The Big Bang Theory: The Definitive, Inside Story of the Epic Hit Series

‘The Big Bang Theory: The Definitive, Inside Story of the Epic Hit Series’.Grand Central Publishing

Ken Miller: The show really took off in the third and fourth seasons.

In my opinion what really cemented it is when it was pretty much equal men and women.

Now Penny had a posse, too, and it really worked.

After my episode in the season three finale, I literally thought my character might never come back.

I had been out of the industry for so long .

it really could have gone either way.

That’s how it started; what it would grow into would reveal itself later.

But Chuck was the biggest early adopter and proponent of Mayim.

There was no choice but to evolve the character.

That was notable for me, only in that I almost never disagreed with the writers.

Should we bring in a monkey?You know what I mean?

And that made me really sad.

They’d like to offer you a full position as a regular!"

It was completely my own craziness.

But once I was made a regular, I was still teaching neuroscience and tutoring piano.

Then all that stuff kind of petered out because I had a full-time job.

But I was not used to that!

I had gotten my PhD about five years before.

I was living my best hippie, science, mom life pretty much out of the industry.

So it completely changed everything.

It was just supposed to be a onetime job.

It was such a gift and lesson that’s a great reminder even now.

That same advice could be credited for how the writers approached Amy early on.

And not just with any female, but with Pennysomeone whom she admired and adored.

The desperation of wanting someone to think you were their best friend.

And not only someone, but someone as cool and popular as Penny.

I know that feeling.

I’ve said those words that Amy said.

So to have that kind of outlet was extremely cathartic.

Chuck Lorre: Initially, Amy was just an offshoot of Sheldon.

But that didn’t work at all.

So all right, it was a baby step.

The show evolved because it was seen through different eyes.

Reprinted with permission of Grand Central Publishing.