With “Downton Abbey” about to be reborn as a feature film, NBC is getting in on the celebration of the revered PBS period drama. The network announced plans for “Return to Downton Abbey: A Grand Event,” an hourlong special airing Thursday, Sept. 19.

The movie “Downton Abbey” arrives in theaters on Friday, Sept. 20, with a story line about a visit from the King and Queen of England. The film comes from Focus Features, which is collaborating with NBC on the TV special.

The NBC special, to be hosted by two-time Emmy Award winner Derek Hough and filmed at the historic Highclere Castle in England, will feature cast members talking about the original series and how it segues into the feature film.

In addition, celebrities will discuss their “Downton Abbey” obsession and talk about what made the show so addictive.

The series “Downton Abbey” was a worldwide phenomenon and won 15 Emmy Awards, including Outstanding Miniseries or Movie; creator Julian Fellowes for Outstanding Writing for a Miniseries, Movie or Dramatic Special; and two for Maggie Smith for Outstanding Supporting Actress in her role as Violet Crawley, Countess of Grantham.

The film is written by Fellowes and directed by Michael Engler.