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Sylvester's father, a retired general, asks the team for help when he thinks a dictator in Africa has uncovered weapons of mass destruction from World War II.

The members of Team Scorpion are asked to help NASA with a top-secret rocket launch, but they must sabotage their own mission when Walter's date finds a bomb strapped to her chest.

When a powerful earthquake hits Los Angeles, Team Scorpion must prevent a pinched gas line from causing a massive explosion.

Harry Langford enlists McGarrett and Danny's help to track down a teenage British royal who has run away while under his protection; Grover, Tani and Junior work a 25-year-old murder case after a mysterious videotape arrives at headquarters.

Duke is forced to steal crucial evidence from the police locker in exchange for his kidnapped granddaughter; Jerry goes undercover at a mental health facility to solve a murder.

McGarrett and Five-0 take on the mob when a former boss is killed; Junior's friend is on the run after witnessing the murder.

McGarrett joins Junior and his SEAL team on a mission to capture an elusive person who is holding his mentor hostage; Gerard Hirsch and Kamekona help Grover and Tani on a murder case involving art stolen by Nazis during World War II.

The team discovers a Russian spy ring hiding on Oahu when a Russian submarine appears off the coast.

After McGarrett's CIA agent friend is killed, he lets himself be captured by the group he thinks is responsible to find the killer; Tani questions whether she should tell McGarrett about the murder weapon she found at Adam's house.

When a vacationing father on a flight to Honolulu is kidnapped and forced to parachute midflight, Danny, Tani and Junior track him through the jungle to discover that he may not be who he seems; McGarrett is threatened with a secret from his past.

A heat wave hits Oahu, contributing to a spike in crime; McGarrett and Danny hunt down a bank thief; Tani and Junior's car is stolen while they're on duty; Kamekona incites a riot by price-gouging his ice.

Jerry accompanies Junior as he escorts a fallen soldier home to Oahu; McGarrett and Danny discover a body when they delve into the highly profitable black market for sand.

On Halloween, Jerry and his friends search his childhood camp for evidence to a murder he witnessed as a boy; McGarrett investigates a little girl who drew pictures depicting the scene of a recent murder before it was discovered.

McGarrett crosses the line and is arrested while investigating the death of his former SEAL buddy who died while making an emergency landing on an aircraft carrier; Adam returns to Oahu with devastating news about his marriage.

McGarrett investigates a cold case that his grandfather and the famous Honolulu detective Chang Apana worked on in the 1940s; McGarrett and Danny get ready for the opening of their restaurant.

Grover's parents and brother arrive in Oahu for Thanksgiving; a thief is crushed to death by an empty safe.

When a renowned urban vigilante is killed after making a citizen's arrest, the team delves into the world of superheroes and comic books to find the killer; Adam gets closer to finding out who killed his sister.

After fighting off an assassin in his own home, McGarrett and Joe White flee to Montana to prepare for a battle against those exacting revenge for a past SEAL mission.

Still reeling from the murder of one of their own, Steve and Catherine, along with Danny, Junior and some old friends, hunt down the killer; a bag of human bones discovered inside an abandoned storage locker goes missing.

McGarrett and the team support Danny and Rachel by determining what happened when Grace gets into a life-threatening car accident; Tani helps Koa when his rehab patient goes missing.

Adam, Junior and Tani travel to the bottom of the Pacific Ocean when a murder takes place in a remote underwater lab -- and the killer may still be on board.

While investigating Flippa's friend's murder, McGarrett and Grover uncover a deadly plan by an extremist group on the Island; Grover has an emotional reaction to the case.