After five original movies, Hallmark Channel’s Fall Harvest event is coming to an end with its final premiere, “Good Witch: Spellbound,” on Sunday.

Not only is this debut different from all the others because its the final one and its on a Sunday, but also because it’s actually a two-hour special of Hallmark’s Catherine Bell-led series “Good Witch,” which will kick off the show’s fourth season.

It’s all full circle, though, as the show actually began as a TV movie in 2008, “The Good Witch,” and had multiple sequel movies before becoming a show in 2015. Now, the series goes back to its movie roots each Halloween for a witchy special, this year’s holiday being no exception.

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“Good Witch: Spellbound” premieres on Hallmark Channel on Oct. 22. Crown Media/Shane Mahood

Season 3 ended in July and now the characters are back to shake things up and celebrate Halloween like only they can.

“Inside the dark and dusty basement storage room of City Hall an old, sepia-toned photo taken of Middleton resident Cotton Perriwood on his porch, festively decorated for Halloween, is discovered. Along with it are a wooden crate containing four gargoyles and muslin sheets that bear the cryptic Perriwood prophecy,” the synopsis for the special reveals.

“The enchantress Cassie Nightingale (Catherine Bell) tells the legendary story to Grace (Bailee Madison): Perriwood was believed to have used magic to cause disasters in Middleton, was banished as a result and never again saw the Merriwick woman he loved. He vowed revenge, leaving behind a written prophecy that Middleton would suffer a great curse one future Halloween night.”

Because of the luck these women normally have and the troubles that they sometimes have to deal with, it’s safe to assume that that Halloween night has likely arrived. That said, as nothing bad has actually happened yet, they all continue to go about their ways, getting ready for the holiday, as they normally would.

“While Cassie and Grace, as well as Stephanie (Kylee Evans), Abigail (Sarah Power) and even Sam (James Denton, with some coercing, begin decorating for Halloween, a mysterious stranger (Noam Jenkins) arrives in Middleton. With an uncanny likeness to Cotton Perriwood himself, he is very interested in the decorative displays around town, creating a nervous uneasiness in everyone,” the synopsis continues.

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Noam Jenkins plays a mysterious stranger in “Good Witch: Spellbound.” Copyright 2017 Crown Media United States LLC/Photographer: Shane Mahood

That’s when weird things start happening around town, just as they were predicted in the prophecy. There are jack-o-lanterns crashing, frogs appearing in the fountain and bats flying all around.

“Meanwhile, Grace conjures up a magical idea to bring out the spirit of Halloween and benefit the children’s ward in the hospital by creating a special decorating contest where residents participate in a ‘Halloween Crawl’: go from business to business and judge who has the best decorations, followed by a big costume party at Grey House.”

What was meant to bring people together, the event ends up creating conflict, only adding more problems to the mix.

With Grace left to try to fix the competition issue, “Martha (Catherine Disher), worried that the curse could threaten all of Middleton, sneaks the pages away from Cassie to scour them and find clues, convinced Cassie and Sam hold the key to breaking the curse and saving the town.”

Is the curse real and the prophecy actually coming true? If so, will Cassie find a way to stop it? Find out the answers to those questions when “Good Witch: Spellbound” airs on Hallmark Channel on Sunday at 8 p.m. EDT.