Walter, Cabe and Happy become trapped in a top-secret submarine with a limited oxygen supply and the potential to self-destruct after an explosion propels it to the bottom of the ocean.
Pandora unleashes a creature that seeks to kill those discovering secrets. Meanwhile, Abbie's new boss arrives in Sleepy Hollow, and Joe goes to Jenny seeking answers.
When Harris and Boyle, helped by Brian, investigate the murder of a retired FBI agent, they find a link to the elusive head of a notorious drug cartel. When Brian reconnects with an old flame, he worries she's only interested in the NZT version of him.moreless
Sylvester goes undercover in a federal prison in order to save the lives of three judges, but the team must help him escape when his life is threatened.
Nine months after the deaths of Henry and Katrina, Ichabod is arrested returning to the U.S. Abbie--now an FBI agent--gets him out and they discover that a new evil has been unleashed upon the world.moreless
Brian puts his new job with the FBI in jeopardy when he disobeys orders to stay out of an investigation into the murder of a renowned journalist.
The team travels to Cuba to catch a Serbian war criminal after a woman from Cabe's past pleads for his help; Alana De La Garza returns as the new head of Homeland Security; and Walter meets a new friend while completing court-mandated community service.moreless
A man named Brian Finch develops superhuman abilities after taking a mysterious drug called NZT in the series premiere of this adaptation of the 2011 film starring Bradley Cooper, who serves as executive producer and reprises his role as Eddie Morra. First up: Brian attempts to clear his name of an NZT-related murder being investigated by the FBI.moreless
In the second season premiere, a nuclear-powered Russian satellite is knocked out of orbit and the team reunites to divert its course before it detonates over Southern California. Meanwhile, it is revealed that Paige kissed Walter, which forces them to confront their feelings for each other. Gene Simmons makes a guest appearance as himself.moreless
Five-0 investigates the murder of a bounty hunter who was killed after he apprehended a fugitive. Meanwhile, Rachel reveals a long-held secret to Danny that has serious ramifications.
Season 5 ends with Five-0 learning that a stolen nuclear bomb is somewhere on the island and is about to be detonated. Meanwhile, McGarrett is stunned when Catherine returns to Hawaii; and Chin confronts Adam about his lingering connections to the Yakuza, on the eve of Adam and Kono's wedding.moreless
Kono fights for her life when she encounters rough weather while on a solo catamaran trip around the Hawaiian islands. The journey is something her mother always wanted to do but was never able to experience.moreless
Five-0 helps sober up three married men and sort out the events of their wild night to find who killed the woman found in their hotel suite. Jerry witnesses a woman’s kidnapping off the streets of O'ahu.moreless
In the season finale, the team, although torn apart and uncertain as to their future, must come together to save Walter's life as his car hangs off the side of a cliff.
Walter learns Cabe's long-hidden secret regarding the Baghdad mission and it threatens to tear Team Scorpion apart. Meanwhile, Ralph puts his life in danger to help the team.
When an Elvis impersonator is killed and his body stolen, Five-0 is on the case after it's discovered the culprits are after the hidden diamonds sewn into the victim’s costume. Gabriel returns asking for Chin's help in getting off the island.moreless
Grover's oldest and closest friend tells him that he witnessed his wife fall off a cliff to her death, but Grover suspects it was no accident. Meanwhile, Danny and Dr. Shaw get trapped in an elevator with a dead body that needs to be processed.moreless
Team Scorpion's helicopter crashes while on a mission to save lost hikers. The crash ignites a massive wildfire that quickly closes in on them. Meanwhile, Sylvester tries to help the injured pilot who is unable to make it to safer ground.moreless
McGarrett and Odell come under siege in Odell's barbershop when they try to protect a man who is being hunted by a gang. Meanwhile, Jerry is wrongfully accused of committing a series of home invasions.moreless
Team Scorpion is asked to assist secret peace talks when a conflict in Eastern Europe heightens and threatens a World War III scenario.
Danny and Chin are arrested for deadly past transgressions. McGarrett enlists Joe's help in the investigation.
Steve and Danny work on their relationship when they stake out the apartment of a woman who fled from a diamond robbery.
Trapped in the past, Abbie tries to convince Ichabod that they are future partners while trying to stop Katrina from assuring the Horseman's victory.
A tech billionaire hires Team Scorpion to rescue his kidnapped daughter. Meanwhile, some feelings get hurt when Walter gives an interview and fails to acknowledge the other members of the team.
Five-0 works with a California ATF agent to locate a serial arsonist targeting couples on Oahu. Danny and Amber's romantic getaway is ruined when her abusive ex-husband tracks them down.
Ichabod and Abbie try to stop Henry's scheme to use a mystic bell to create a new cult of witches. However, they learn that he has an unexpected ally. Meanwhile, Irving comes after Jenny.moreless
A journalist is killed and Five-0 uses his reporting to track down a presumed dead Congolese warlord who is alive and living on Oahu. Meanwhile, Danny overreacts when Grace's text to a boy start accidentally showing up on his cell phone.moreless
Ichabod and Abbie find a new series of tunnels beneath Sleepy Hollow and have an encounter with an old friend of Ichabod's. Meanwhile, Katrina receives a visit from Henry, and Jenny receives a visit from Irving.moreless
Team Scorpion work undercover on a cruise ship to locate and disable stolen rockets. Meanwhile, Toby and Happy help Ralph deal with his first crush, as Valentine's Day approaches.