Hallmark Channel’s “Countdown to Christmas” event continues with the premiere of “Christmas Comes Twice,” starring Tamera Mowry-Housley, Michael Xavier and Sheryl Lee Ralph.

The film should be a treat for fans, as it will be Mowry-Housley's first on Hallmark Channel. She previously starred in Hallmark Movies & Mysteries’ “A Christmas Miracle,” but is likely best known for her roles as Tamera on “Sister, Sister” and her co-hosting gig on “The Real.” Xavier will also be making his Hallmark debut, having previously starred in the Lifetime holiday films “Radio Christmas” and “Christmas on Wheels,” as well as the Netflix film “Christmas Inheritance.” Ralph will be a more familiar face to fans, as she has previously appeared in Hallmark films such as “Fashionably Yours” and “Christmas at Holly Lodge.”

So what will happen in the first-ever “Countdown to Christmas” film starring Mowry-Housley and Xavier?

“Cheryl Jenkins (Mowry-Housley) is an astrophysicist who works for the National Science Foundation reviewing grant applications for projects, although she’d prefer to be working on a project of her own,” a synopsis reads. “Cheryl heads home to spend the holidays with her family and first on the agenda is a visit to the annual Christmas carnival with her sister Trish (Zarrin Darnell-Martin).”

However, the trip to the carnival will take a very unexpected turn for Cheryl—literally.

Christmas Comes Twice
Michael Xavier and Tamera Mowry-Housley star in “Christmas Comes Twice.” Crown Media LLC/Ryan Plummer

“While there, Cheryl sees a carousel in the distance and ventures over to take a ride. But when the revolutions wind down and she returns to the carnival to find her sister, Cheryl discovers that—somehow—it's five years earlier,” the synopsis continues. “Cheryl sees this as a chance to change her path by making different choices.”

As she goes through the journey through her past and works to change her future, Cheryl also reconnects with the science teacher who inspired her, Ms. Nelson (Ralph)-- as well as George (Xavier), a “frenemy” who starts to make her see things differently.

Now, after finding her way—and a romance that takes her by surprise—Cheryl will have to hope that the changes she made in the past will have a positive effect on her new future.

“But when the carousel returns Cheryl to present-day Christmas with lessons learned, will the love she found be waiting for her?” the synopsis reads.

“Christmas Comes Twice” premieres Sunday, Dec. 13 at 8 p.m. EST on Hallmark Channel.