Bull navigates the unfamiliar rules of a Native American tribal court when his college roommate is accused of committing murder on a reservation. Also, Bull meets Marissa’s new boyfriend.

Bull is brought on to help the FBI’s case against a hacker whom they believe breached air traffic control at LaGuardia Airport. But when Cable learns that the accused is her friend’s husband, she risks breaking the law—and defying Bull—to try and prove his innocence.

Danny enlists her colleagues to help when her boyfriend, Gabriel, is arrested for being in the country illegally and threatened with deportation. Also, Bull represents a German national who is being sued by a museum over possession of a valuable painting.

Bull and the TAC team represent a teen boy raised in complete isolation when the young man goes on trial for murder after engaging in a deadly shootout. As the trial gets underway, Bull looks to select jurors who believe his sheltered client acted under the misguided influence of the only other person he has ever known, his survivalist father.

Bull fears that his client’s family ties will negatively impact the jury when TAC represents the seemingly innocent young heir, Connor McCandless, of an infamous crime family on trial for murder with his brother. As the trial begins, Bull aims to convince his client to sever his trial from his brother’s, which would pit the siblings against each other in court.

Taylor becomes personally invested in having Bull help a dancer, Jessica, bring a civil suit against a real estate mogul who assaulted her at a gentlemen’s club when the district attorney’s office refuses to pursue criminal charges. As the TAC team faces an uphill battle in court due to the defendant’s fame and popularity, Bull aims to select jurors who believe privileged people don’t deserve special treatment.

Bull defends a train engineer who has no memory of a fatal crash he allegedly caused, due to a brain injury he sustained in the collision.

Bull uses the First Amendment's freedom of speech to defend a controversial news commentator blamed for a man's suicide after she accused him on air of murder

Izzy puts the brakes on her wedding to Bull after he jeopardizes Benny’s election campaign by handling the defense in the corruption trial of the former District Attorney that Benny hopes to replace. Season finale.