When Naz is detained on suspicion of funding terrorism, Brian and Rebecca's efforts to clear her name lead them to Naz's daughter, Ava, who reveals a family secret Naz is keeping from the FBI.

The episode was rated 7.68 from 2645 votes.

When Brian begins to experience the side effects of NZT again, Senator Morra demands he betray Rebecca in exchange for another inoculation. Also, Brian secretly looks for an alternate cure for himself while he works with Rebecca outside FBI parameters to find the creators of NZT.

The episode was rated 7.69 from 2675 votes.

Brian offers to use NZT to capture the FBI's "Ten Most Wanted" criminals in two weeks, in exchange for Naz giving him his own personal work "headquarters" at the agency. Also, the secretive nature of Brian's new life working for the Bureau creates a rift between him and his father.

The episode was rated 7.70 from 2599 votes.

Brian risks his new FBI job when he disobeys orders to stay out of the investigation into a renowned journalist’s murder.

The episode was rated 7.70 from 3451 votes.

When Boyle’s former military buddy is accused of murder and blames it on the loss of control of his prosthetic arm, Boyle asks Brian to help determine if the artificial limb was hacked. Also, Brian’s father demands he stop working for the FBI.

The episode was rated 7.70 from 2575 votes.

When Agent Casey Rooks and his SWAT team skim 80 NZT pills for themselves from the recovery of stolen inventory, it starts an internal investigation that is viewed through the shifting perspectives of Brian’s immediate circle at the FBI.

The episode was rated 7.74 from 2607 votes.

When Brian's closest relationships implode due to his inability to cut ties with Eddie Morra, he goes rogue from the FBI to free himself from the senator's control. In Russia, he searches for Piper, Morra's former associate turned adversary, and her alternative NZT vaccine. Also, Rebecca comes closer to discovering Brian's connection to NZT and Senator Morra.

The episode was rated 7.76 from 2404 votes.

When an assassin makes an attempt on Senator Edward Morra's life, Brian is ordered to sabotage the FBI's investigation into it in order to prevent exposing the Senator's connection to NZT. As Brian and Morra's fates become further intertwined, Brian is faced with how far he's willing to go to protect the politician.

The episode was rated 7.79 from 2578 votes.

When Sands, Senator Morra’s deadly representative, enlists Brian’s help to eliminate an immediate threat he needs to keep secret from the politician, Brian learns Sands’ dangerous and shocking past. Also, Brian’s sister, Rachel, scrambles to cover up his abrupt side mission with Sands when the FBI can’t reach him regarding a new case.

The episode was rated 7.80 from 2401 votes.

Brian and Rebecca are placed under quarantine by the CDC after being exposed to an unknown substance after investigating a citywide blackout. Also, trust issues arise after Rebecca catches Brian using his secret stash of NZT.

The episode was rated 7.83 from 2388 votes.

Brian’s double life unravels when Senator Morra makes contact just as Brian’s placed under 24-hour surveillance by the FBI following his rogue trip to Russia. Also, Mike and Ike tell an already suspicious Rebecca about Brian’s off-book interaction with Morra’s henchman, Sands.

The episode was rated 7.84 from 2508 votes.

Brian Finch's life takes an extraordinary turn when he uses a mysterious drug, NZT, that allows him to access his full brain capacity. However, when an NZT-related murder lands Brian on the FBI's radar, he uses the drug in an attempt to stay ahead of the authorities long enough to clear his name.

The episode was rated 7.89 from 3968 votes.

When Rebecca learns the truth about her father’s death, she takes NZT for the first time and uses it to seek justice for his murder. Also, Sands makes a dangerous move against Brian to ensure the success of his new initiative.

The episode was rated 7.93 from 2893 votes.

When NZT floods the streets of New York City and threatens to become a national epidemic, the FBI partners with the DOJ in a city-wide manhunt to find the lab producing the drug. Also, Brian has trouble adjusting to his new reality when he lacks the resources to continue searching for Piper.

The episode was rated 8.08 from 2841 votes.

Following a stunning betrayal to their team, Brian and the FBI race to stop an NZT-enabled Sands and his associates from orchestrating an international incident. Also, Brian experiences devastating side effects when his NZT immunity starts to wear off.

The episode was rated 8.10 from 2928 votes.