Limitless

Brian Finch discovers a powerful drug called NZT that unlocks his full cognitive potential, but he becomes entangled in a dangerous situation after a murder linked to the drug draws FBI attention. To evade capture and prove his innocence, Brian uses NZT to outthink and outmaneuver the agents pursuing him.

Brian jeopardizes his position at the FBI by interfering with an ongoing investigation into the murder of a prominent journalist, despite being ordered to remain uninvolved.

Brian assists FBI agents in investigating a retired colleague's murder, uncovering a connection to a powerful drug cartel leader. Meanwhile, he reconnects with an ex, Shauna, and fears her interest may be motivated by his use of NZT.

Brian faces a moral dilemma when FBI loyalist Sands pressures him to steal confidential files on NZT from the agency. Meanwhile, Agent Harris grapples with emotional turmoil after discovering what her late father left her.

Brian uncovers a surprising truth about Rebecca's deceased father and must decide whether to reveal it, fearing potential legal consequences. Meanwhile, while taking self-defense lessons from Rebecca's secret boyfriend, FBI Agent Casey Rooks, Brian unintentionally gets involved in her personal affairs.

Brian experiences a return of NZT's side effects, prompting Senator Morra to demand his cooperation by threatening Rebecca. Meanwhile, Brian covertly seeks an alternative cure while partnering with Rebecca outside FBI guidelines to uncover the origins of NZT.

Brian is taken by the CIA after calling in sick, tasked with a covert mission using his NZT-enhanced abilities. As the mission turns more perilous, he realizes he is on his own without the support of the FBI.

Naz is arrested on suspicion of funding terrorism, prompting Brian and Rebecca to investigate and seek help from Naz's daughter, Ava, who discloses a hidden family truth that complicates their efforts to exonerate her mother.

Brian proposes using NZT to apprehend several of the FBI's most wanted fugitives within two weeks, in return for a dedicated workspace at the agency. His covert involvement with the Bureau begins to strain his relationship with his father due to the secrecy surrounding his new role.

Boyle enlists Brian's help to investigate whether a prosthetic arm was hacked after a former military comrade is accused of murder and claims the device malfunctioned. Meanwhile, Brian faces pressure from his father to quit his job with the FBI.

An internal FBI investigation unfolds after Agent Casey Rooks and his SWAT team are discovered to have taken NZT pills from a recovered shipment, with the events examined through the viewpoints of those close to Brian.

An assassin's attempt on Senator Edward Morra's life prompts Brian to interfere with the FBI's investigation to conceal Morra's ties to NZT. As their connection deepens, Brian must decide how far he is willing to go to protect the senator.

Brian's first FBI field assignment takes him to Quantico, where he joins a unit specializing in catching serial killers. His mission becomes complicated when he suspects his new partner may have wrongfully convicted an innocent man in a high-profile case. At the same time, Brian works to avoid being caught by Rebecca, who is getting closer to uncovering Senator Morra's involvement with NZT.

A developer at a tech think tank is found murdered, prompting Brian and Rebecca to question a robotic replica she built prior to her death in hopes of uncovering the killer. Meanwhile, Brian evaluates potential agents for a new bodyguard role alongside Mike and Ike.

When a list revealing undercover agents is leaked, Brian forms an unexpected bond with FBI Agent Lucy Church as he assists her in completing a case before her identity is revealed. Meanwhile, Sands takes an unexpected step to halt Rebecca's inquiry into Senator Morra.

Brian is drawn into a covert mission by Sands, a lethal enforcer for Senator Morra, who requires his assistance in neutralizing a hidden threat that cannot be disclosed to the senator. As Brian uncovers Sands' disturbing history, his sister Rachel works to conceal his sudden absence from the FBI, which is trying to contact him about a separate investigation.

Brian and Rebecca are quarantined by the CDC following exposure to an unidentified substance during a citywide blackout. Meanwhile, tensions grow in their relationship when Rebecca discovers Brian using his hidden supply of NZT.

Brian severs ties with the FBI after his personal relationships collapse, driven by his ongoing entanglement with Senator Eddie Morra. He travels to Russia to find Piper, Morra's former associate, and an alternative NZT vaccine, while Rebecca edges closer to uncovering Brian's involvement with the drug and the senator.

Brian's secret activities come under scrutiny as FBI surveillance begins following his unauthorized visit to Russia, and his colleagues Mike and Ike inadvertently heighten Rebecca's suspicions by revealing his clandestine meeting with Sands, a subordinate of Senator Morra.

Rebecca begins using NZT after discovering the truth behind her father's death, determined to uncover justice. Meanwhile, Sands takes a risky action against Brian to advance his new project.

As NZT becomes widely available in New York City and risks turning into a nationwide crisis, federal authorities launch a coordinated operation to locate its source. Meanwhile, Brian struggles to adapt to his changed circumstances without the means to keep looking for Piper.

After a shocking betrayal, Brian and the FBI work urgently to prevent Sands and his NZT-enhanced allies from triggering a global crisis, while Brian begins to suffer severe consequences as his immunity to NZT diminishes.