Hallmark Movies & Mysteries announces the network’s first-ever “Most Wonderful Movies of Christmas Preview Show,” a one-hour Original Special, starring Holly Robinson Peete (“For Peete’s Sake”) will premiere exclusively on Hallmark Movies & Mysteries on Saturday, October 21 (10 p.m. ET/PT, 9C). Peete is joined in the special by Hallmark Movies & Mysteries rescued and adopted pet, Happy The Dog.