With a line-up of hair-raising Halloween picks, the guys crawl back underground in Pennsylvania in search of the "Mole Man." Later, the guys look for rusty relics at an abandoned Oklahoma amusement park. In Missouri, Mike and Frank tour a former penitentiary with a seriously spooky vibe. Notorious for hauntings, the massive institution is one of the darkest and creepiest places they've ever picked.
Oliver discovers a man who goes by the name “The Mayor” is bringing illegal guns in to The Glades, so Oliver sponsors a “Cash for Guns” event to help clean up the city. Unfortunately, The Mayor crashes the event with his gang and seriously injures Sin. The Canary is furious when she learns her friend is in the hospital and sets out for revenge. Meanwhile, Felicity stuns Oliver with a bit of information about the Canary, Donner asks Laurel to dinner, and Diggle reconnects with an old friend.
A contestant is put on the spot by an ultimatum; a contestant may be undermined by her honesty.
Colette ends up realising that her marriage troubles aren't over just yet. Dani and Steve get some bad news from Dani's father. Tom decides to start dating again but cannot forget about his feelings for Miranda.
Sue holds a seance with her friends, the football team stops Axl from attending the Halloween party in his room, and the family tries to give Brick advice about girls.
Buffalo Airways is still reeling from the recent accident – especially mechanic Chuck. Mikey tries to lift spirits by setting up a hockey shootout against a squad of NHL players that the airline is transporting around the north. He drafts a team and Buffalo's best players – including Chuck – test their shots against Ottawa goalie Craig Anderson. Young DC-3 co-pilot David flies farther north than he's ever been, facing a mysterious landing gear problem on approach to a remote Arctic airstrip. When his captain gets flustered, the rookie has to keep his cool.
Andy’s business venture tanks as the murder case tightens, and the healing of the Stoney family comes full circle when Leona and Gail ask their ailing mother to move back to Blackstone.
The police face a race against time to identify and capture the killer as he steps up his campaign, targeting a further elderly victim in his 'moral' crusade.
Tools and ingredients are wrapped in aluminum foil; the chefs cater a Halloween party for singer/actress Lea Michele, and the food must be spooky and vegetarian.
Fiona's choices rattle a decades-long truce between the Salem witches and Marie Laveau; the Council of Witchcraft pays a surprise visit to the academy with disturbing allegations.
The CSI team investigates the death of a homeless man who had a huge winning streak at a small casino.
Pete's lineups at work are out-performing his fantasy roster. Andre makes a trade with Jenny that could threaten his career. Rafi and Taco try to cash in on Kevin's mortality.
Frank hires a new chef through his refugee center - an acquisition that catches Torgeirs attention in more ways than one. The death of Duncan Hammer attracts both the police and his brothers crew - bringing them closer to Torgeir and Frank.
The BAU are called to Utah to investigate the murder of a women who died by being buried under stones. All while Penelope plans a Day of the Dead party.
The Doyles investigate an unusual murder that resembles the work of an eccentric novelist.
Rudy sees his father with another woman. Jess helps Rudy investigate his dad and uncovers an even deeper secret.
Danny takes the team trick-or-treating; Lulu tries to teach Terry to celebrate Halloween as an adult; The Cannon lets his competitive streak get the best of him during a visit to the cemetery.
Taking their love of climbing, canyoneering and mountain biking to the extreme, Simon and Turbo head to Hurricane, Utah, to compete in the annual “Six Hours of Frog Hollow” bike race. The 12.8-mile looping course winds perilously through gaping canyons, alongside sheer cliff drops and over large boulders – presenting huge challenges for both guys, and a near catastrophic accident for Turbo.