The fourth season of Hawaii Five-O, an American television series, began September 14, 1971, and ended on March 7, 1972. It aired on CBS. The region 1 DVD was released on June 10, 2008.

Season 4 Episode 11 - A Matter Of Mutual Concern

McGarrett must deal with the conflicts between four gangs of differing ethnic background, and try to uncover illegal activities. Air Date : 23rd-Nov-1971

Season 4 Episode 1 - Highest Castle, Deepest Grave

A ten year old case is reopened when an archaeological dig unearths the skeletons of two murder victims. Air Date : 14th-Sep-1971  Read More

Season 4 Episode 2 - No Bottles... No Cans... No People

Gangster Johnny Oporta arranges for his enemies to be murdered and then covers up his crimes by incinerating their bodies. McGarrett and the others must stop this murderous spree. Air Date : 21st-Sep-1971  Read More

Season 4 Episode 3 - Wednesday, Ladies Free

Vic Tanaka is murdering women and painting their faces to resemble a prostitute he once knew, who is now happily married. McGarrett and his team must find the killer before he does any more damage. Air Date : 28th-Sep-1971  Read More

Season 4 Episode 4 - 3,000 Crooked Miles To Honolulu

Five-O is up against a sophisticated gang who have come to Hawaii to cash $750,000 of traveller's cheques. Air Date : 5th-Oct-1971  Read More

Season 4 Episode 5 - Two Doves And Mr. Heron

A hippie robs an embezzler of the key to a locker containing $250,000. Meanwhile, Danno is trying to contact the daughter of his Berkeley University landlady, who happens to be the hippie's girlfriend… Air Date : 12th-Oct-1971  Read More

Season 4 Episode 6 - ...And I Want Some Candy And A Gun That Shoots

Young Vietnam veteran and marksman Billy Shem Jr. buys a rifle under false pretences and proceeds to a bunker at Diamond Head. He then takes pot shots at the people on the road and then the police who arrive. McGarrett must neutralise the threat he poses by any means possible. Air Date : 19th-Oct-1971  Read More

Season 4 Episode 7 - Air Cargo -- Dial For Murder

While investigating the death of a security agent at an airport, McGarrett comes into contact with a gang who hijack cargo. Air Date : 26th-Oct-1971  Read More

Season 4 Episode 8 - For A Million... Why Not?

Five seemingly good citizens with different motives band together to steal $6,000,000 while McGarrett is away on Maui at a trial. Air Date : 2nd-Nov-1971  Read More

Season 4 Episode 9 - The Burning Ice

McGarrett finds holes in a convict's story and a husband becomes a suspect in the murder of his wife. Air Date : 9th-Nov-1971  Read More

Season 4 Episode 10 - Rest In Peace, Somebody

A policeman who was kicked off the force blames McGarrett and Five-O and plans to kill the Governor. Air Date : 16th-Nov-1971  Read More

Season 4 Episode 11 - A Matter Of Mutual Concern

McGarrett must deal with the conflicts between four gangs of differing ethnic background, and try to uncover illegal activities. Air Date : 23rd-Nov-1971  Read More

Season 4 Episode 12 - Nine, Ten -- You're Dead

A mob boss seeks revenge on a former boxer who smashed the hand of a novice to prevent him from ending up ruining his life in the boxing ring. Air Date : 30th-Nov-1971  Read More

Season 4 Episode 13 - Is This Any Way To Run A Paradise?

McGarrett and the team must find out who is behind a series of ecological stunts, when it is feared that a company executive will be their next target. Air Date : 21st-Dec-1971  Read More

Season 4 Episode 14 - Odd Man In

A veteran criminal who has already had dealings with Five-O escapes, and plans to steal millions of dollars from drug smugglers. Air Date : 28th-Dec-1971  Read More

Season 4 Episode 15 - Bait Once, Bait Twice

A woman attempts suicide in order to get her boyfriend to come out into the open and expose himself to an assassination attempt. Air Date : 4th-Jan-1972  Read More

Season 4 Episode 16 - The Ninety-Second War (1)

McGarrett is framed in an elaborate set up by Wo Fat, and has to contend with a foreign double amongst other problems. Air Date : 11th-Jan-1972  Read More

Season 4 Episode 17 - The Ninety-Second War (2)

Several faces from the past reappear as McGarrett must stop Wo Fat from carrying out his plan, a ninety second attack on a missile tracking base. Air Date : 18th-Jan-1972  Read More

Season 4 Episode 18 - Skinhead

When a young woman is beaten and raped and a soldier is arrested for the crime, McGarrett begins to have doubts about his guilt. Air Date : 25th-Jan-1972  Read More

Season 4 Episode 19 - While You're At It, Bring In The Moon

An eccentric billionaire is accused of murdering a business associate, but will not leave his boat to defend himself against the accusations, allowing his associates to declare him mentally incompetent. Air Date : 1st-Feb-1972  Read More

Season 4 Episode 20 - Cloth Of Gold

Three real estate crooks die horrible and mysterious shellfish related deaths, and McGarrett and the others must establish the link between them, and who has reason to want them dead. Air Date : 8th-Feb-1972  Read More

Season 4 Episode 21 - Good Night, Baby - Time To Die!

McGarrett sets up a cordon of police around a young woman to capture her boyfriend who has escaped from jail, but all is not as it seems… Air Date : 15th-Feb-1972  Read More

Season 4 Episode 22 - Didn't We Meet At A Murder?

A young widow becomes part of a blackmail plot involving the murder of a Chicago mobster. Air Date : 22nd-Feb-1972  Read More

Season 4 Episode 23 - Follow The White Brick Road

Danno goes undercover onboard a Navy ship to try and uncover how sailors are smuggling heroin onto the islands. Air Date : 29th-Feb-1972  Read More

Season 4 Episode 24 - R&R -- &R

A psychotic man named Ralston is killing the wives of members of his army unit, and Five-O, including Kono on his last case, must stop him before he commits any more crazed attacks. Air Date : 7th-Mar-1972  Read More