Ben Stillman arrives at Heartland and his treatment of his horse Red angers everyone. Ashley lures Ty to Briar Ridge with a job offer.

The teams take off from the starting line at the Playboy Mansion in Beverly Hills, California and are instructed to fly to Shannon, Ireland. A flight delay leaves teams that thought they were ahead scrambling to catch up. The teams travel to the world's smallest church and then sign up for one of the three ferries departing the next morning. They're then directed to drive 42 miles to Cleggan farm where they must ride a tandem bike to a clue. One member of each team then completes a task that involves more biking -- highwire bicycling while their teammate rides below. Many teams are then frustrated by a task that requires them to fill a basket with fifteen pieces of peat and then transport it using a donkey. Controlling the donkeys proves more difficult for some teams than others and once again some leading teams take a plunge. Ultimately, one team is unable to recover from poor performance on this task and is eliminated from the race.

The 18th installment of the Treehouse of Horror series.



E.T. Go Home

Bart and Lisa help Kodos "phone home," but Kodos uses their assistance to secretly plan something sinister.



Mr. & Mrs. Simpson

A parody of the 2005 film Mr. and Mrs. Smith, featuring Marge and Homer as the title characters.



Heck House

Flanders decides to scare Bart, Lisa, and their friends straight after they go too far with their Halloween pranks.

Michael goes after more power while he and Kath get ready for their little addition to the family. Tommy tries to fix the problems in a bad area of The Hill. Eileen learns from other politicians wives.

Katie and Jesse are left to do the chores around the lodge by Danny and Jo. They ditch on the chores, Katie goes to visit a bar with Oliver but skips out on the bill, which leads to both ending up in jail.

Playboy magazine contacts Kris, asking her to tell Kim that they want her to be on the cover of their December 2007 issue. Kim is at first hesitant, but at Kris' urge, Kim poses for Playboy. Kris thinks that Kim is complaining over the photoshoot too much and Kim thinks that Kris doesn't know how hard it is to pose nude, so Kim "plays" manager for a day by setting her mom up for a nude photoshoot, which Kris surprisingly handles well.

When Francine's adopted parents stop by for an unannounced stay, Stan is furious that they refuse to assimilate to his "man of the house" ways. After he unsuccessfully tries to give them the boot, he is convinced that finding Francine's birth parents will change things. Meanwhile, Steve tries to live to the extreme in order to get to second base with the class hottie.

When human remains are discovered at the bottom of a well, the team opens the 1938 case of a housewife who went missing the night of Orson Welles' radio broadcast of War of the Worlds.

This is the show's first Halloween episode. Edie Britt's biggest fear comes true when Carlos walks out on their relationship. Susan finds Mike's father - who was supposedly dead. Danielle goes into labor right in the middle of the Halloween party...and somebody has to deliver the baby.

Lois and Peter sail off on a cruise. Jealous that he was left behind, Stewie's matricidal tendencies are rekindled. When Brian challenges him to actually do it, Stewie carries out his diabolical plan.

Without telling the judge, Sebastian and Danny head south of the border to find a defendent who left the country in order to avoid being jailed following the murder of his business partner/mistress.

A copy-cat killer inspired by the Bay Harbor Butcher begins to stalk Miami criminals, much to Dexter's chagrin. As Dexter tries to stop the fake, he tries to recover a video that might expose him for who he really is.

Kitty gets a visit from an old friend to do some damage control regarding her pregnancy. But it doesn't go as planned. Sarah is struggling with Paige, while Justin is down.

Larry tries to use Cheryl's therapist to get back into her good graces after getting bad advice from his own; Larry's miffed at Marty's participation level in an Alzheimer's walk

The Kool-Aid Man quenches some inconvenient thirsts; The mystery of why Enyclopedia Brown's parents aren't getting along; What new realm will D&D's Venger conquer next?; Wonder Woman reveals her revealing arch-enemy; Celebrities are drunk, but that's not why they go to rehab, they go to conquer the world!

It's Martin's wedding day and he manages to offend the vicar who is due to conduct the ceremony by suggesting he has a drink problem. When they struggle over a bottle of whisky, the vicar falls over, fracturing his pelvis and Martin has to find a replacement. Pauline suggests the former vicar of Delabole, who strikes a deal. He will conduct the wedding ceremony if Martin will examine his sick pig. Bert and Al are putting the finishing touches to the wedding banquet when disaster strikes. Last in the series.