Danny's friend Greg is found murdered in the desert, reporter is hot on the trail of a naughty senator, and King Arthur is riding through the casino.

When Ed (James Caan) is kidnapped, Danny (Josh Duhamel) and Mike (James Lesure) begin a frantic search of the city to find him. The fact that Ed refuses to let them contact autorities or pay the kidnapper's ransom only makes their search more difficult. Sam (Vanessa Marcil) arranges a Vegas-style wedding for one of her clients, but it comes to a screeching halt when their lucky rings are lost. Elsewhere, Mary (Nikki Cox) and Delinda (Molly Sims) collaborate when the Montecito hosts a popular 80's rock band (Duran-Duran).

When a local restaurateur (and mother of a Montecito showgirl) is approached by petty mobsters, Ed enlists the support of a long-time friend "Frank the Repairman" (guest star Sylvester Stallone) to quash their extortion attempts. As the two navigate their way through the local mob's hierarchy, Ed discovers that he has a decades-old connection to the ringleader. Elsewhere, Danny and Mike feverishly work to reclaim $100,000 stolen from the casino by a cunning thief. Once the thief's identity is revealed, Danny concocts a clever scheme to make good on the money before Ed discovers the truth. Meanwhile, Joe Rogan (as himself ) visits the casino in search of a little R & R. Sam , Delinda and Nessa who are desperate to be contestants on Joe's show, compete with each other for his attention.

Mike's omission of his nuptials to his family prompts him to put together a wedding for his mother's sake, as well as his family, which sparks Danny to do something sudden. Sam's deceased ex-husband's brother shows up with surprising plans of his own.

In the third season premiere, Ed's got major problems as the revamped Montecito struggles to finish work in time to re-open on new boss' Monica Mancuso's (Lara Flynn Boyle) schedule as he also tries to lure back Danny and his former staff to prevent a suspected "smash-and-grab" heist that has hit other casinos. But convincing Danny and the gang proves to be difficult since each has his or her reasons for leaving, and what's more, Ed suspects two construction hard-hats are planning an inside robbery once the Montecito's doors swing open again amid much fanfare.

It's Christmas and everybody in the Montecito is forced to take part in Ed's secret Santa gift exchange. At the same time Danny's car, his most valuable possession, is stolen on Christmas Eve. Delinda is planning her first Christmas with Danny. And Sam gets an autographed photo of Elvis during one of his first concerts as a surprise for one of her favorite "whales."

A mobster purchases a Montecito million dollar wedding package (which includes a fully catered wedding, a Harry Winston engagement ring, luxury treatment, and Wayne Newton) but difficulties arise because there are problems between Ed and Wayne Newton. Meanwhile somebody has stolen diamonds and it's difficult finding the thief because so many mafia members are attending the wedding. And Danny and Delinda find out that living together is tougher than they thought.

When the colorful billionaire Fred Puterbaugh (guest star Jon Lovitz) returns to the Montecito, with new girlfriend singing star Ashanti (as herself), there is bound to be some great entertainment. But once Ed and Danny discover exactly what brought the incorrigible billionaire back to Vegas, an audacious performance is the least of their worries. Meanwhile, a beguilling magician uses his skills to help Ed catch a slippery thief. Elsewhere, Sam finds new meaning in the words 'feminine wiles' when a highroller's wife makes a visit to the casino spa.

Falling in love with a new temporary Montecito employee known only as "Bob the floater" (guest star Christian Kane), Nessa begins pressing her new mystery man for more personal details. However, when she discovers that her new beau is actually suffering from amnesia and walked into the hotel several days again hoping to jar his memory, Nessa turns to Ed in the hopes of uncovering the truth about Bob. Meanwhile, a guest's discovery of a revealing picture of her undressing in a hotel cabana on the internet, sends Danny on the hunt for a peeping camera man whose lens has also captured a revealing side of Delinda. Sam's war of words with a world-champion eater prompts her to enter an eating contest, enlisting Mike as her trainer.

Sam's whale is named Trey Cooper, a handsome 30-year-old who brought his Great Dane to the casino. There are a lot of dogs around the casino as the Nevada State Dog Show is taking place. Jillian enters the Deline's dog in the competition. Monica and Danny meet with an 80-year-old woman named Dottie. Monica offers 3 million for Dottie's house in order to build a golf course. Things will become complicated when on the demolition site, construction workers find a skeleton. A CSI believes it could be the body of Seymour "Blue Jaw" Magoon, a member of a 40s gang called Murder Inc. Mike helps a couple who's "stuck" together. Jake seems to still be in Mary's life. Mike is still helping Danny to find information on the woman his father was dating before he died.

Danny and Mike probe serial robberies in the casino's residential suites and also find time to serve as models for a charity calendar. Meanwhile, Jillian is alarmed when she discovers her marriage to Ed may have adversely affected Delinda. Mary deals with a hard to please European.

Nicole one of Ed's former employees comes to the Montecito for her first wedding anniversary with her husband Ollie. Ed becomes suspicious of him and makes Mike and Danny watch him. Also Mary and Sam start fighting as they can't decide which guests are more important to get "OK GO'S" tickets.

After Sam's "whales" check out a strip club she calls in "The Cleaner" to help keep it secret from their wives. Meanwhile, Mike and Piper try to hire a sexy new bartender for the Montecito but instead find themselves sampling the cocktails and engaging in one of Vegas' oldest cliches. Cooper challenges Danny to bring more people to the Montecito while Delinda throws an unusual party.

Danny has a busy day coddling an oddball winner, trying to locate a missing high roller, and figuring out a cheater's MO. Big Ed finds his daughter sleeping with Danny.

Danny and Ed uncover a car thief, and Ed's cousin, Donny, meets the woman of his dreams at the roulette wheel and decides to get married immediately. Delinda ends things with Danny and decides to get a job.

Nessa secretly meets with a cheater busted by Ed and Danny. A psychic gives Mary a dire prediction about his next show. Delinda starts work in the kitchen, but isn't there long.

Danny and Ed hunt for a sexual predator targeting hotel guests.

Ed takes a Hawaii vacation leaving Danny in charge. Mike becomes the good luck charm for a gambler on a hot streak.

Mary gets Wayne Newton to help an unlucky couple. A grifter passes counterfeit chips to Delinda. Sam is kept busy by two regulars who bet on anything.

Ed's ex-CIA partner heads security for a diva. A full-comp VIP gives no gaming action. Penn & Teller have a cameo.

A high roller's rowdy daughters become Danny's responsibility. A small-town fiancé is seduced by the tables as Mary organizes a group wedding. Mike is sued by a drunk woman he rescues.

A magician's wife disappears as scheduled, but fails to return. Mike's college buddy is in town. A convention of swizzle-stick collectors requires extra security.

The casino hosts a boxing match. Delinda, Nessa and Mike find a bag of cash. Blue Man Group has a cameo.

Big Ed's former CIA protégé Jack Keller (Alec Baldwin), is now a security consultant supervising the Montecito's switch from analog to digital surveillance. Brooks and Dunn get on a lengthy roll at the crap table. Ed sees red when a comic turns blue.

Sin City screeches to a halt as a massive power outage brings down the light of the strip, locking down the Montecito, while a mysterious hotel guest is shot on the casino floor. In the midst of the blackout, super sleuths Nessa and Delinda attempt to find the casino killer, while a semi-delirious Sam flirts with paranoia as she suspects the murder to be part of an elaborate cover-up. Elsewhere, a trapped Danny and Mary spend the blackout rehashing some old feelings, while a claustrophobic Mike works tirelessly to free Ed and himself from the lockdown surveillance room.