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In the season finale, Laurel discovers the secret to driving the bugs out of a person's brain and tests the tactic on her father. Armed with new knowledge, Laurel and Gareth attempt to expel the Queen bug out of Red's head once and for all.

Luke and Laurel rush to uncover Red's secret agenda, which is buried in a huge new budget bill. Also, Gareth accidentally witnesses an unsettling bug encounter in Red's office.

Laurel has to work alongside an old boyfriend, Ben Valderrama, when Luke enlists her help in putting together a political documentary to support his anti-war initiative. Also, Laurel worries about the health of Luke and Germaine's infant.

Senator Red Wheatus hires a special investigator to dig into the Healy family?s financial and personal history. Also, when Gareth learns some sordid details about Laurel?s romantic past, it puts a strain on their budding relationship.

Rochelle and Gustav capture and question a man they suspect is infected by the bugs. Also, Luke and Red face off in a Senate Intelligence meeting about a potential war.

Laurel comes under investigation about her potential involvement with the bug infestation. Also, Gustav and Rochelle discover a unique way to communicate with those infected by the bugs.

When Laurel is infected by the bugs, Gustav and Rochelle work quickly to figure out if there is any way to save her. When the Centers for Disease Control has its funding temporarily cut, Luke attempts to reach a compromise to have the money reinstated, but Red’s political machinations undermine him at every turn.

Laurel seeks her brother's help to get the Centers for Disease Control and Prevention to investigate the bugs, but he insists she first consult Dr. Joanne Alaimo, a leading entomologist, for her perspective on the invasion. Laurel's relationship with Anthony takes an unexpected turn.

Laurel and Rochelle try to persuade Laurel's friend Abby to get an MRI so they can uncover the real cause of the strange behavior taking over Washington, D.C. Luke attempts to reopen the government through a secret deal with the Republicans

When a bizarre and deadly incident occurs on live television, Agent Onofrio's investigation into it causes Laurel, Gustav and Rochelle to delve deeper into the bug mystery.

Laurel continues to investigate the death of esteemed Dr. Daudier, while bugs infect more citizens of Washington, D.C. Rochelle Daudier (Nikki M. James), the deceased doctor's daughter and Gustav Triplette (Johnny Ray Gill), an eccentric genius, both encounter the bugs separately and begin to question exactly what is happening.

When Laurel Healy (Mary Elizabeth Winstead) returns home to Washington, D.C. to work for her brother, Senator Luke Healy (Danny Pino), on Capitol Hill, she is caught in the midst of two huge problems: the government has stopped working due to budgetary disagreements, and mysterious bugs are eating the brains of a growing number of Congress members and Hill staffers.