An ensemble of  30 Island thespians is busy right now, polishing a beloved holiday chestnut to roll out on Thursday.

Drama Dock’s show, “A Christmas Carol: Scrooge and Marley,” is an adaptation of Dickens’ tale, told from the point of view of Jacob Marley, the ghostly apparition who first warns Ebenezer Scrooge that he is hell-bound if he doesn’t change his ways.

Marley, played by Drama Dock veteran Gordon Millar, appears not only as a moaning, chain-dragging ghost in a midnight scene with Scrooge, but he also takes a lighter turn as the narrator of the play, escorting audiences through a travelogue of Ebenezer’s life and times.

“It’s a good role, and a meaningful piece about redemption,” Millar said. “People can relate to it, especially to the character of Scrooge. You come away saying, ‘maybe I should get my own act together.’”

Another well-known Drama Docker, Chaim Rosemarin, is cast as Scrooge.

For Rosemarin, a self-proclaimed “Jewish kid from Brookyn,” it’s a thrill to play the iconic role.

“It’s one of those parts that every actor of a certain age would love to tackle,” he said. “The problem is there are already so many who have already done it and done so well at it. Trying to find something new is the challenge.”

Rosemarin said that although he’s worked hard to keep his character true to Dickens’ vision, he’s also explored some ways to freshen up the character.

“Some people will say, ‘gee, that was a new take on Scrooge,’ and there will be others who walk away saying ‘bah, humbug,’” he joked.

The show’s artistic team includes director Chris Ott and Drama Dock artistic director Elizabeth Ripley.

The show also boasts the talents of a bevy of young Islanders, playing parts that include young Scrooge, his sister Fan, his true love Belle, the Fezziwig girls, the Cratchit kids, and of course, the biggest small part in the play — Tiny Tim, played by Calvin DeGraaf.

The kids in the show also act as a roving children’s chorus, adding Christmas carols to the dramatic mix.

Drama Dock’s “A Christmas Carol” can be seen at 7:30 p.m. Dec. 16, 17, 22, 23 and 26, and 2 p.m. 18 and 24, at the Blue Heron. Buy tickets, $15/$10, at the Blue Heron, Heron’s Nest, Vashon Bookshop and www.brownpapertickets.com. A special show on Thursday, Dec. 15, will support the Vashon Maury Community Food Bank. Audience members should bring canned food donations or purchase a ticket at the door.