Kessler and Carver hover near death while Gray hunts down Layla's killers. A bloody highway shoot-out with the crime mob 'Ndrangheta has left Major Kessler and Agent Carver fighting for their lives. The Squad is forced to the sidelines, as Special Counsel Louise Tilden investigates the role of ICS in the much-publicized tragedy. Meanwhile, Gray, who has been suspended from duty, sets out to avenge the murders of Layla and his father Dougie.

ICS must find a sadistic kidnapper before he auctions off his 12-year-old victim on a pedophile website.

Kessler, Gray, and Layla are trapped aboard a quarantined freighter with a captain who's accused of murdering stowaways.

ICS discovers that toxic sludge is being trucked across the border and dumped in the Canadian wilderness. They follow a trail to a vicious criminal gang, who gain control over Gray and his father. As Gray struggles to save his father, he sets off a chain of events which bring about the season's shocking conclusion.

When his daughter takes part in an anti-nuclear rally, Kessler is suspected of leaking classified information that leads directly to nuclear sabotage.

ICS must prevent the assassination of a visiting Cuban diplomat who has a surprising connection to U.S. Agent Bianca Lagarda.

The frozen body of a Russian man is found in a railway car triggers an ICS investigating of the smuggling of blood diamonds via the Canadian north.

ICS races to prevent a deadly terrorist attack in the heart of Toronto.

ICS helps a movie star enter the country with her newly adopted son: a Sudanese refugee with a dark past and an even darker secret.

The American President's upcoming visit to Canada has the ICS Squad on full alert. Working with DHS Agent Liz Carver and the Secret Service Advance Team, ICS sifts through hundreds of threats and uncovers an assassination plot by a Lebanese terrorist, working for the Iranian Revolutionary Guard. But as Slade digs deeper, he discovers the trail they've been following is an elaborate electronic smokescreen created by a sophisticated hacker. To make matters worse, an internal security leak means the real assassin is always one step ahead of the Squad.

A kingpin in Mexico's Los Zetas drug cartel is en route to Toronto to meet his new distributors - the ultraviolent street gang, MS-13. Ramon Esteban - the new flame of Kessler's ex-wife Terri - is a Mexican journalist whose articles on Los Zetas have put him on the cartel's hit list. When Kessler, Carver, and Gray attempt to transfer Ramon from Terri's shelter into protective custody, MS-13 launches an all-out attack. Kessler must fight back with an unlikely team of warriors.

ICS Agent Gray Jackson butts heads with a beautiful U.S. Homeland Security Agent when their undercover operation at a Mohawk casino goes awry.

When CSIS sends a suspect to Syria to be tortured the elite ICS, Squad must race to prove him innocent.

Counterfeit pharmaceuticals kill an American rock star. ICS searches for the Canadian link but Bianca LaGarda takes matters into her own hands.

A U.S. rendition flight crash-lands in rural Quebec and ICS must recapture three terrorists before the Americans forcibly intervene.

ICS Director Kessler and U.S. Agent LaGarda clash with disgruntled ex-Airborne soldiers and an elusive arms dealer while hunting for stolen military weapons.

When wealthy philanthropist Benjamin Herzog is murdered, the prime suspect is his financial advisor Cyrus Church. Church has engineered a massive Ponzi scheme to defraud his investors of billions. Foreign operatives determined to recover stolen funds are also looking for Church. And complicating matters, Church's new trophy wife is Svetlana Karpov, a Russian stripper from Kessler's past. ICS's newest agent, Khalida Massi, finally gets a chance to prove herself in the field.

ICS face escalating gang violence when a U.K. Tamil gang member enters the country for his son's life-saving surgery.

Now back on active duty, DHS Agent Liz Carver tracks a murder suspect, the notorious white-supremacist Cole Thorpe, to Canada. Kessler assigns Gray to infiltrate Thorpe's British Columbia-based neo-Nazi operation. Carver still blames Gray for the 'Ndrangheta debacle and her own injuries. When Gray learns the neo-Nazis are planning a devastating act of racial terrorism, Carver must work with him to stop it.

Kessler suspects the Canadian military is complicit in the cover-up of a scheme to smuggling cheap Afghan heroin into the country.

A snuff film is confiscated at the Maine-New Brunswick border, and Carver finds the body of the film's victim Stateside. ICS traces the video back to the vicious biker gang, Satans Guard. Maggie goes to the east coast to see her estranged daughter Kim whose boyfriend, a former member of the gang, is eager to inform on his former associates. Meanwhile, ICS learns of a cross-border serial killer - who has just set his sights on Kim.

Three American army deserters claim refugee status in Canada, and ICS must deal with the personal and political fallout.