Basically, Phineas and Ferb have a Halloween party with all their friends. Two new kids, Thalia and Namashi Capellan, who are creepy twin sisters, show up as well. Be Very Afraid Of My Halloween Party by Phineas and the other partygoers Trick Or Treat by the partygoers * This is the third Halloween episode (the first two being "One Good Scare Ought To Do It!", and "Monster Of Phineas-and-Ferbenstein"). * The creepy twins Thalia and Namashi were based on Gaz from Invader Zim and the twin girls from The Shining. * The Scary Halloween Spooktacular Party Of Horror script