Years ago when the most dangerous prisoners of Alcatraz mysteriously disappeared, they resurface in the present day as part of a larger conspiracy, leaving a police detective, an expert on Alcatraz and an FBI agent to track them down.
Blair's flashbacks reveal the fallout of her and Chuck's car accident, which Nate realizes may have been caused by foul play. Meanwhile, Lily gets a private eye to locate Charlie; and Vera Wang makes an appearance at Blair's bridal-dress fitting.
When a sniper begins targeting young victims, the team is forced to retrace the steps of the past in order to solve this modern day mystery.
Kowalski tries to bring a penguin species back from extinction, but clones a Dodo instead.
Julien is supposed to keep quiet about the penguins' secret tunnel, be he blabs anyway.
Chin Ho shares news about Joe White that rocks McGarrett to his core; Danny is forced to play midwife when his ex goes into early labor.
Tricky Dick's Tennessee yard is littered with treasures, and though he isn't motivated to part with any of it, Mike goes hog-wild for a vintage pig ride that could be worth some serious coin. Once a legendary Mississippi radio station, Mike and Frank visit a sprawling small-town museum steeped in music history. A tough negotiator who doesn't like to sell, Phil's ramshackle building is packed with salvaged gems. But with the roof caving in, the guys hatch a strategy to make sure everyone wins before the building collapses.
A layover in London, Tony's "home away from home," means catching up with chef friends Marco Pierre White and Fergus Henderson. He has just enough time for a few pints and a visit to a real-life little shop of horrors before his flight home.
When Kristen Pratt accepts a Facebook friend request from Patrick Macchione, she has no idea he's a maniac. When he starts stalking her via YouTube, she understands: Nothing will stop her cyberstalker from tracking her down with deadly intentions.
Sandi Musk is a successful businesswoman looking for Mr. Right. What she finds is Andy Lefleur, a handsome young man with a violent streak. When Sandi tries to call off the relationship, she is in for a nightmare beyond belief.
When the Furious Five go out of town and the Jade Palace is attacked, Po has to rely on a team of elderly Mahjong players for back-up.
Aviva wants to build a food web for the African savannah, so she devises a game and Martin and Chris accept her challenge!
Zoey tries to convince Walden to cut his hair and shave; Alan and Lyndsey revive their relationship.
It was longtime Castle friend Mayor Weldon's political clout that allowed Castle to partner up with Beckett. But now, when a woman is found dead in a car that traces back to the Mayor's motor pool, that partnership comes under fire as the scandal surrounding the investigation threatens to bring down Weldon's administration.
Library books seek help from Finn and Jake to save them from the evil Moldari.
Hanna fears a vengeful visitor, Aria arranges to encounter Ezra, Spencer turns investigator, and Emily worries a renewed relationship is under threat.
It's Carly's dad's birthday, and things don't go as planned. He was supposed to come home for his birthday and celebrate it with Carly and Spencer, but can't make it because of some emergency. Sam and Freddie feel bad about what happened so they connect her up with him through a video chat.
The Pawn Stars are blown away when a pair of WWII bomb fins drop into the shop. Designed to keep bombs on target, will the guys try to blast out a deal for these rare military items, or will they run for cover as the negotiation implodes? Then, Rick tries to get in tune with a guy who brings in a Martin guitar signed by 60's super group Crosby, Stills and Nash. Will Rick's offer be music to the seller's ears, or will he get nothing but feedback? And later, the guys continue their daunting search for a new employee to work the night shift. Will they pick beauty over brains or go with a safe bet?
The Pawn Stars are amazed when a first issue Spider-Man comic book swings into the shop. Potentially worth hundreds of thousands of dollars, will the guys have the spidey-sense to buy this super rare book or will they tangle up the negotiation? Then, a guy moseys in with an antique 1860 Colt Army Pistol. Considered the assault weapon of it's day, will Rick have the firepower to draw up a deal? And later, Old Man checks out a gold mining stock certificate issued to author Mark Twain. Issued in 1876, will the deal pan out, or will the guys end up in a deep hole?