'Millie Bobby Brown's 'Stranger Things' co-star reflects on their bond and his role as wedding officiant in a 'very emotional day'.'

Matthew Modine, who plays a character in "Stranger Things," has a close relationship with Millie Bobby Brown, his co-star. Despite their on-screen tension, they have a strong bond off-screen. In fact, Brown has chosen Modine to officiate her upcoming wedding.

Modine first met Brown at 11 years old while playing "Eleven" on the show. As Dr. Martin Brenner, Modine's character is portrayed as an antagonist who allegedly worked for the U.S. Department of Energy, as a senior research scientist and as the director of the fictional Hawkins National Laboratory. In season four, it was revealed that he held children with supernatural abilities captive in a lab and forced them to participate in experiments. Given this, it's no surprise that Eleven has little affection for him.

Despite the audience's love for hating the TV villain, he has a softer side when it comes to romance. Last year, Brown, 20, and her fiancé Jake Bongiovi, 21, son of rocker Jon Bon Jovi, announced their engagement on Instagram. Though they have not disclosed their wedding plans, it was recently revealed that Brown asked Modine to officiate their wedding.

"Millie Bobby Brown, who has been working with Winona Ryder since she was 11 years old, will have an emotional day, according to Winona Ryder."

Another friend of his motivated Modine to become a wedding officiant.

"I remember a friend of mine getting married and we were discussing the wedding plans. He asked, 'Who will officiate the wedding?' I knew that I could get the necessary licenses to perform the ceremony and legally marry someone. He expressed interest in having me officiate his wedding. He went out of his way to obtain all the paperwork and took me to the place where I became an officiant. It was his wedding and it was the first time I had performed the ceremony."

"It's a beautiful thing to be able to speak on behalf of a group of people," he marveled. "He's really speaking for everyone... So when you say, ‘Dearly beloved, we are gathered here, in this event,’ so you're bringing people together to join two people in what hopefully could become a great bond, a union between two human beings."

Caridad Rivera, Modine's own wife, was fondly remembered by him, and he wished for Millie and Jake to experience the same happiness.

"I've been married for four decades and my wife is my best friend, greatest confidant, teacher, and everything to me. I think it's extraordinary to find someone to share our lives with. I don't judge marriages that don't work out because they're complicated, and some people grow together while others grow apart. Regardless of how long it lasts, a great marriage is a beautiful thing. I wish that for Millie and Jake."

Modine stated that working with young actors like Brown has given him the chance to offer advice and perspective as they embark on their early Hollywood careers.

"It's an opportunity to share your knowledge and experience in the motion picture industry and television, as well as to discuss the concept of celebrity and its significance in the industry," he said. "When we watch the credits on a film, it's important to recognize that everyone whose name appears at the end of the film played a role in its creation."

He stated, "You are one of the elements in it, and you may be the first person mentioned and the one on screen. However, you cannot perform your job without the contributions of others who are involved in the film's production."

Recently, Modine starred in the critically acclaimed "Oppenheimer," which won the Best Picture trophy at the Oscars. His upcoming film, "Hard Miles," is based on the true story of social worker Greg Townsend, who led a cycling team of juvenile convicts on a 1,000-mile bike ride from Denver to the Grand Canyon.