A government employee discovers that the cause of the tensions between the two political parties is a race of extraterrestrial insects eating the brains of the politicians.
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.
When Laurel discovers that a senate bill is not what it appears, she implores Luke to help, leading to a dramatic Senate sit-in. Also, Red and Ella battle for control of the bug agenda, and Laurel questions whether or not she should leave Washington, D.C. for good.
Luke and Laurel rush to uncover Red's secret agenda, which is buried in a massive new budget bill. Also, Gareth inadvertently witnesses an unsettling bug encounter in Red's office.
Laurel must 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 baby.
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.
