Big changes have been happening on NCIS, including the appearance of a big guest star - the First Lady of the United States.

Michelle Obama is headed to primetime as herself in one episode, wherein she will promote the Joining Forces initiative, which helps the families of military veterans and service members.

The episode titled "Homefront" will have the first lady welcoming NCIS special agent Leroy Jethro Gibbs and the wife of a Marine. Both of them will take part in a Joining Forces military spouse roundtable at the White House. Aside from the first lady's cameo there will be real military spouses filling in as extras.

"Filming inside the White House was a dream come true for the NCIS cast and crew," said Gary Glasberg, producer of the show. He added that it was a pleasure to work with the first lady and they're very willing to help, since it promotes and benefits military families and their cause.

Joining Forces is an initiative across the United States that aims to support veterans, servicemen and their families, which was launched in 2011. Every year, it has urged Americans to help through wellness programs, education and career opportunities, especially after service men retire. The initiative was founded by Michelle Obama and Dr. Jill Biden, the wife of Vice President Joe Biden.

The first lady isn't new to prime time dramas. She had previously guested on Nashville and also appeared in an episode of the Disney Channel's Jessie and Project Runway: Junior.

"I brought a crew and we spent a day in the White House. It was a dream come true for all of us," Glasberg said. "We feel honored and privileged."

NCIS is a hit TV series revolving around a team of special agents from the Naval Criminal Investigative Service. They probe and solve crimes involving the U.S. Navy and Marine Corps.

The TV show airs on CBS every Tuesday at 8 p.m. The first lady will appear in the episode scheduled to air on May 3.

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