Swedish couple Sonnie Gustavsson and Josefin Sockertopp crossed an ocean to get married at a London “Star Trek” convention Friday,  in what is thought to be the first Klingon wedding ceremony in the United Kingdom.

Gustavsson, 29, and Sockertop,23, who work together at a retirement home in Sweden, spent about three months planning all the wedding details after getting the idea from an episode of “Star Trek: Deep Space Nine.” The wedding, held at the weekend-long convention “Destination Star Trek London,” billed as the first of its kind in 10 years, included traditional Klingon garb and ceremonial props, as well as Klingon vows and blessings.

The couple both wore prosthetic foreheads, matching floor length red costumes, and black wigs adorned with traditional crystal circlets.

"We saw the clip from the series ... and we thought it was very romantic about beating hearts and a battle for each other. We really liked it, that's why we want to do this,” said Gustavsson, a lifelong Trekkie who introduced the series to Sockertopp. But his bride confessed that she needed a little more persuading.

“The ceremony was his idea. I thought about it a lot and then I said ‘let’s do it’. It’s a once in a life time thing,” Sockertopp said in a BBC interview. "I hadn't seen Star Trek until I met him. He introduced me to it and it was really good,"

The only downside for the couple, who were legally wed at a registry office in Sweden before flying to London for the convention, was that they had to keep their nuptials a secret from both families, and none of their relatives could attend.

"Mum didn't talk to me for three days and my father wonders if there is something contagious about weddings as my big sister got married in secret last week,” said Gustavsson. ‘It must be something in the gene pool.”

The couple’s vows, which were exchanged in Klingon, the language of the fictional race of “Star Trek” characters of the same name, included the promise to unite against all their opponents. Gustavsson said that rehearsing the proper pronunciation was one of the biggest obstacles for him.

"That was a bit of a challenge and I hope I got some of the sounds right. I had it written phonetically, so that made it a little easier," he said.