Hawaii Five-0 - Season 3 (2012)

While Five-0 investigates the beheading of a polo player, McGarrett's mom returns to pay him a surprise visit.

A gruesome murder on Halloween night appears to be related to a Satanic ritual, and Five-0 must find the killer before he claims a second victim.

While Five-0 discovers a terrorist cell on the island, Danny has a flashback to one of the most eventful days of his life while working as a Newark police officer in 2001.

Mary arrives in Hawaii and finds out that her Mom is still alive, while Five-O team tries to find out why a high-school boy gets kidnapped.

McGarrett is convinced that a psychiatrist murdered one of her patients, but will she get the last laugh? Meanwhile, Catherine discovers that an assassin is on the island and is looking for Doris McGarrett.

McGarrett discovers that a botched bank robbery actually wasn't about the money, while Danny protects a Victoria's Secret supermodel who has been threatened by a stalker.

McGarrett and a young girl are held hostage by a diamond thief during a campout, and Kono's boyfriend, Adam, welcomes his brother back from prison and gives him an offer to become a legitimate businessman.

The team helps find a boy's father, and discovers that his disappearance is related to moonshiners and a reclusive bank robber.

A college professor is murdered, but who is the killer: his boss, his teaching assistant, or one of his students? Meanwhile, Kono is assigned to protect an annoying witness released from federal prison.

Chin Ho is drugged, kidnapped, and placed in a maximum security prison as retaliation for Frank Delano's death, but will he be able to make it out alive?

The governor asks Five-0 to handle a delicate investigation involving a dead prostitute, but is he really trying to cover up the case for an important political ally?

A sniper with two prosthetic hands is killing police officers, and McGarrett may be on his list.

Five-0 connects the murder of a local businessman to a fight club, and McGarrett asks an old friend to do surveillance work on his mother.

McGarrett and Danny's plans to go to the NFL Pro Bowl are interrupted when a computer executive is murdered during a team-building exercise at a corporate retreat.

Five-0 discovers that a murdered kindergarten teacher had a secret life as a roller derby star, and some very important information is stolen from Doris McGarrett's safe and could put her in danger.

After an explosion on a shark tour boat, one of the boat's owners is found dead in a submerged shark cage. Meanwhile, McGarrett helps Kamekona get his helicopter pilot license.

McGarrett and Catherine go in a secret mission to North Korea to find the body of one of McGarrett's fallen SEAL buddies.

A talk show host and crew follow Five-0 around as they try to solve a grisly murder with ties to both Wo Fat and the Russian mob.

Five-0 discovers the body of a missing 17 year old girl who was kidnapped 10 years earlier, and soon learn that the captors may already have a new victim. Meanwhile, Kono suspects that her boyfriend may be keeping secrets from her.

McGarrett helps Doris on a dangerous mission to retrieve stolen microfilm, and Kono is shot while investigating a lead about Yakuza secret burial site that may be connected to her boyfriend.

While Five-0 searches for an escaped federal prisoner connected to a terrorist plot, Kono tries to clear her name after her gun is used in a murder.