The most frightfully fun event of the season is here. The all-new original Halloween special, “Muppets Haunted Mansion,” is now “screaming” on Disney+. Join Gonzo, Pepe the King Prawn, Kermit, Miss Piggy and the rest of the gang, along with a star-studded cast, as they traverse the most grim-grinning location, the Haunted Mansion, in what is sure to be a night of fantastical frights.