Jack is faced with breaking some dire news to Mia, while at the same time he's compelled to hide vital information from her and his brother.
Season Finale: Emily's decision about starting a relationship with Micah becomes even more complicated when Will hears about it and begins to feel jealous. Emily and Tyra treat an unruly woman, but after learning of her home hoarding situation, Emily wonders if the woman's personality changes may be caused by her many cats. Now that Cassandra and Will have broken up, Cassandra's strictly professional behavior distracts Will and causes him to misdiagnose their patient. Meanwhile, Micah's sister comes to town after finding out the truth about their mother.
Jenni proves to Roger that she can handle the outdoors. Roger later reveals some private information. Snooki and Jionni are left exhausted while taking care of Lorenzo.
Michael Portillo takes to the tracks once again using his Bradshaw's 'Handbook for Tourists in Great Britain and Ireland' from the Victorian era. Portillo is on a railway journey through the Republic of Ireland travelling from the rugged beauty of County Kerry, across the rural Irish Midlands to end in the city of Galway on the Atlantic coast. In this episode, Michael learns the ancient art of butter making, attempts to learn the basics of Ireland's oldest game, and rides the Duke of Devonshire's Victorian Irish railway.
At HowStuffWorks, Josh and Chuck use a company-wide time capsule initiative to settle an old bet on time travel, getting physicist Michio Kaku tangled in the scheme During the podcast the guys cover time paradoxes and causal loops.
Michael Portillo takes to the tracks once again using his Bradshaw's 'Handbook for Tourists in Great Britain and Ireland' from the Victorian era. Portillo is on a railway journey through the Republic of Ireland travelling from the rugged beauty of County Kerry, across the rural Irish Midlands to end in the city of Galway on the Atlantic coast. In this episode Michael samples nineteenth century foodie delicacies, explores a stunning landscape shot to fame by rails and royals and risks life and limb for the gift of the gab.
Barney uncovers the lost episode of Robin’s “Underneath the Tunes” as Robin Sparkles. Meanwhile, Marshall and Lily are concerned that Ted’s new girlfriend is a stalker.
Daphne feels uncomfortable around Travis; Kathryn tries to get closer to Bay by volunteering to work at Carlton.
The dolls must lip synch to the spoken word, as they recreate classic moments from Drag Race history in scene-stealing viral videos.
Fly high and aim low with the Pawn Stars as they check out a Japanese machine gun camera. Used to train fighter pilots during WWII, will the guys have the skills to keep this deal on target? Then, Chumlee and Corey take a look at some sketches drawn by Spider-Man creator Stan Lee. Known as a writer, but never an artist, are they legit, or a web of lies? And later, Rick and the Old Man eye a $1,000 Federal Reserve note from 1918. Will they fork over a stack of hundreds, or is this G note past its prime?
The dismembered body of a roller derby skater means Angela goes undercover at the rink to find more clues to the woman's murder. Elsewhere, Cam worries over the sheer number of doctor appointments Booth is going to, and presses him for details.
Harry becomes an overnight father figure to nine-year-old Billy and teenage Anastasia, who both seem to be the product of Harry's past foray into sperm donation. Meanwhile Harry meets Rose, a beautiful, if neurotic, single woman who's out to have a baby on her own, and who believes Harry may have what she needs to get pregnant.
While investigating the murder of a young woman, Castle and Beckett find evidence that links her death with Senator William H. Bracken (Jack Coleman), the man responsible for Beckett's mother's murder. Determined to finally bring Bracken to justice, Beckett soon realizes that things are far more complicated than they seem.
Stassi comes back from Vegas to find that SUR is not the same, as Jax has started dating one of her friends, and Katie and Kristen have turned against her. When Lisa calls a staff meeting to put a stop to the infighting, Laura-Leigh explodes on Stassi for sending her bullying texts. Scheana nervously prepares for her first live performance at the world-famous Roxy, where after a rocky start, she not only steals the show but makes a very unexpected friend.
When Carrie is invited to a Halloween party in the city by Larissa, she decides to invite Walt to go with her to keep her company. It doesn’t take long before the night goes awry and Carrie is forced to babysit Larissa, who has clearly taken too many drugs. Walt finds himself in an uncomfortable position after a party guest gets a little too close for comfort. Elsewhere, Maggie convinces Mouse to go with her to Sebastian’s Halloween party at the diner to help keep tabs on him. After Doritt’s attempt to sneak out of the house is thwarted, she discovers hanging out with her father isn’t so bad.
In the fourth-season opener, the trio try to reassemble a broken skateboard for their friend.
In an update of an episode from the original series, Five-0 tracks a killer targeting cops… and McGarrett is next on the list.