Kaley Cuocoplayed Penny on “The Big Bang Theory” for all 12 seasons that it aired.

After giving up acting, Penny ends up working as a pharmaceutical sales representative (viaFandom).

“It was a wonderful relationship but we never spoke a word about it and never went anywhere together.

Kaley Cuoco attending an event

That’s not the kind of relationship I want.

I don’t want to be in hiding.”

Keep reading as we rank all of Penny’s ex-boyfriends from “The Big Bang Theory.”

Allen Nabors attending an event

Doug looks away from Penny, utters his one line (“What’s up, bro?

“), and goes back to trying to plant a kiss.

The two were introduced by Leonard after David, a physicist, came to Caltech to work with him.

Michael Trucco attending an event

David was instantly charming, and Leonard was thrilled until Penny and David met and immediately hit it off.

It turns out he has been married the entire time.

To that, Leonard replies (viaFandom), “David Underhill is ten times smarter than me!

Kevin Sussman attending an event

You’d have to drive a railroad spike into his brain for me to beat him at checkers!

Penny ends up falling asleep as the debate drags on and on and on.

Leonard offers bad advice, trying to sabotage the potential relationship between the two.

Brian Thomas Smith attending an event

The two go on one date, but it doesn’t work out.

Penny can’t tolerate Zack’s level of intelligence after having dated Leonard, and things go nowhere.

The two hit it one more time in Season 4.

Johnny Galecki from Big Bang Theory

Zack and Penny break up, but he returns a few years later in “The Thanksgiving Decoupling.”

The two quickly annul their marriage, and no lasting harm is done.

Leonard

From the beginning of the show,Leonardknows that he’s in love with Penny.

Unfortunately for him, it takes time for the two to truly come together.

The two make things work in Season 2 and carry on the relationship throughout Season 3.

When the show concludes, the two are expecting a baby together.