They’ve become the most iconic duo in baseball.

Whether they’re dancing on the dugout, smooching on the kiss cam or greeting fans at the ballpark, you likely won’t catch Mr. or Mrs. Met without the other.

But the two weren’t always a pair.

For the first decade baseball was played at Shea Stadium, Mr. Met walked around solo. "Lady Met," as she was then known, was only two-dimensional.

In 1975, the Mets welcomed more than a dozen new faces to the team. But of all the new faces that season, one stands out among the rest.

On Opening Day 1975, Mrs. Met made her major league debut.

“I was nervous to walk out there because there [were] a lot of fans, and you walked through the stadium and they were running up to you and they wanted your autograph,” said Lynn Farrell, the woman who dressed up as the original Mrs. Met.

She wore an orange dress, a blue cape and a baseball head.

“Which was made of plaster Paris,” Farrell said. “It felt like it was a hundred pounds. The eyes were out of the cheeks and they were grates like metal grates. So I really couldn’t see. I’d have to turn like this and if I had to look down. I’d have to hold this big, huge head.”

Farrell was a junior in high school when her father, a sports photographer for the New York Daily News, learned about the job.

“He came home and said, ‘How would you like to work at Shea Stadium?’” Farrell remembered. Not only did he hook her up with a job, but her boyfriend too.

“Bring him along, well, he could be Mr. Met,” Farrell said.

For $100 a game, their job was to stand with the players for the national anthem, then walk around the stands and sign autographs in the fifth and seventh innings.

“The old men wanted to marry me,” Farrell laughed. “They’d run over to me, ‘Oh, would you marry me, Mrs. Met?’”

The only rule was no talking. But a few games in, and Farrell had to set some of her own rules.

“I learned not to go into the stands because I had a dress on,” Farrell said. “I couldn’t see, and the guys would grab my legs. Then I learned to just stand by the railing by where the guard was and just stand there and let everybody come to me. So I realized real quick why they changed Mrs. Mets’ outfit into pants now.”

It didn’t hit her then that she was — and still is — one of the few female mascots in all of sports. What she says stood out more was just being a girl in a ballpark.

“Being able to go on the field with the players, walking anywhere I want to walk,” said Farrell. “And that was a really cool feeling of, I own this place.”

Farrell played the part for all 81 home games for two seasons. She did not do the third season because she got married to her high school boyfriend, Mr. Met.

They were married for 25 years. Eventually, they moved on from their mascot days, and the team did too.

Both Mr. and Mrs. Met were phased out in the 80s. Mr. Met returned in 1994, but it wasn’t until 2013 that Mrs. Met came back — looking like the Mrs. Met fans know now.

“With her brown ponytail and her pants on, dressed like an athlete,” Farrell said.

Nowadays, Farrell is a bartender, and still a huge Mets fan. She goes to a handful of games a year, though she’s yet to bump into her new, made-over self.

But maybe this season, “I should go up to her,” said Farrell. “Tell her I like her pants.”