28 years have passed since the first Metal Gear was released for the MSX2 home computer. Twenty-eight years of a revolutionary game series, and twenty-two games including the upcoming one. Countless hours of gameplay and entertainment for many people. The story of Metal Gear began an entire genre of Third person over head stealth games as well as one of the most complex storylines of all time.
The first Metal Gear followed Solid Snake sent on an infiltration mission to destroy a bipedal walking tank capable of launching nuclear warheads from any type of terrain. Metal Gear also included a major plot twist that I will not tell in case anyone ever plays the game. However, a major thing was breaking the fourth wall, AKA communicating with the player, and telling the player to turn off the console. This became a major thing for all games afterwords. (All synopsis of story will be kept vague so that spoilers are not included.)
Snake's Revenge is the first sequel in the long line of sequels, and prequels, to come. Very similar to the first game Solid Snake sneaks into an enemy base which has mass produced Metal Gear units and a prototype Metal Gear 2. In the story Snake defeats the enemy commander, Big Boss, and stops a nuclear strike countdown.
Soon after Snake's Revenge Metal Gear 2 is released, and adds more confusion to the former plot of Big Boss coming and creating more mercenary troops and Metal Gear units. This time a scientist who makes an alternative for petrol gasoline is kidnapped by Big Boss to control the economy by the gasoline alternative. Solid Snake is sent in when he meets others who are also infiltrating the bass and Dr. Madnar who created Metal Gear. Madnar claims to have been forced to work on Metal Gear, and Metal Gear D. Later Snake finds that Metal Gear D is piloted by Gray Fox, a former special agent. After beating Metal Gear D they fight in hand-to-hand, which Snake wins. Being stripped of his weaponry he meets Big Boss when escaping and has to face him off with a lighter and aerosol can.
Eight years later Metal Gear Solid is released. Again following Solid Snake must go penetrate terrorist forces, led by Liquid Snake, who are holding a nuclear weapons disposal facility in Alaska to rescue two hostages. When he goes in one of the hostages informs Snake of Metal Gear REX, and is told how to stop it. Suddenly the hostage suddenly dies of a heart attack, and Snake goes to free the other hostage. While doing so he encounters Revolver Ocelot who challenges Snake to a gunfight. In the middle of the fight a "Cyborg ninja" cuts of Ocelots right hand. The hostage debriefs Snake on the situation, but also dies of a heart attack. Snake contacts an unknown third hostage who tells him to meet her at the base's warhead disposal area on the condition that he contacts the designer of the new Metal Gear, Hal "Otacon" Emmerich. When going there Snake get's ambushed, but escapes. When going to meet the third hostage, Meryl, she is taken control of by Psycho Mantis. After beating Psycho Mantis Snake is captured and tortured by Ocelot. Eventually Snake escapes, but accidentally activates Metal Gear REX, which Liquid pilots. Snake defeats Liquid with the help of Grey Fox. While escaping Liquid chases the player in a jeep until he suddenly dies.
In 2000 Metal Gear:Ghost Babel is released which returns to the 2D format used before. This time a Metal Gear prototype is yet again stolen and Snake goes in to destroy it. While doing so he discovers a government conspiracy concerning Metal Gear.
In 2001 Metal Gear Solid 2:Sons of Liberty is released. First you play as Solid Snake who discovers the Marine Corps has made a Metal Gear RAY. However, when doing so Ocelot steals it and destroys the base. Afterwords, you come in to play as Raiden and the destruction of the Marines ship by Ocelot was blamed on Solid Snake going rogue, but the mission is to save the President off of an oil station called Big Shell. The terrorist group is led by Solidus Snake, not Solid Snake, and when Big Shell is revealed to actually be a station full of Metal Gear called Arsenal Gear Raiden has an engineer upload a virus. Suddenly Solid Snake gives Raiden to Solidus where Solidus wakes him up in a torture chamber. Eventually Raiden escapes only to be captured again after destroying 25 Metal Gear Rays. After being freed when Arsenal Gear crashes Raiden learns that Solidus wished to destroy the Patriots which are an organization which controlled politics behind the scenes.
In 2004 three games came out Metal Gear Solid: The Twin Snakes, Metal Gear Solid 3: Snake Eater, and Metal Gear Acid. The first being a remake of Metal Gear Solid. Metal Gear Solid 3: Snake Eater is a prequel that follows Naked Snake who becomes Big Boss. Considering saying much of this plot has many, many spoilers the most I can say is that Naked Snake is sent in to recover a Soviet Scientist named Sokolov. Metal Gear Acid is a turn-based card styled game that follows Solid Snake rescuing a Senator.

A year later Metal Gear Acid 2 is released and follows how Snake obtained his United States citizenship. When he is taken in trying to illegally get into America he is sent to infiltrate a military arms manufacturer who has made a Metal Gear as well as worked with attempting to clone people. 
In 2006 the Metal Gear Solid: Portable Ops is released which is a sequel to Snake Eater. Following it Naked Snakes old unit went rogue and Snake is held captive in an abandoned Soviet missile base. When escaping he finds that he is charged for treason and must stop a rebellion leader to be exonerated of the charges. To do so Snake has to persuade multiple enemy soldiers to join his side to apprehend the leader. When he succeeds and destroys a Metal Gear model the leader gives him everything. Snake is then awarded and establishes FOXHOUND.
Metal Gear Solid Mobile is soon released and features a VR mission where Snake has been kidnapped and forced to complete the mission.
In the same year Metal Gear Solid 4: Guns of the Patriots is released in which Solid Snake has symptoms similar to Werner's Syndrome, but is still sent to assassinate Liquid Ocelot. While there a weapons dealer injects Solid Snake, now Old Snake, with nanomachines allowing Snake to use the current weaponry. However, that proves detrimental when Liquid uses a signal that disables anyone with nanomachines.  In classic Metal Gear and Hideo Kojima fashion soon after this are many plot twists and spoilers that I will leave for you to find out for yourself.
Metal Gear Solid: Peace Walker is soon released in 2010 and follows Naked Snake who is informed that an army has taken refuge in parts of Costa Rica. While there Snake employs the help of the Sandinista Liberation Army and discovers a hidden research facility that has nuclear weapons. There a CIA agent reveals that he wants to fire a live Nuclear missile part of a project called "Peace Walker." While there Snake chases down Peace Walker all along the country and the Nicaraguan border. After Peace Walker is drowned in a lake Snake returns to his mercenary base which has Metal Gear ZEKE. After having to cripple ZEKE Snake accepts the name Big Boss.
Until 2013 with Metal Gear Rising: Revengeance most of the game installments were online or arcade versions. Revengeance is based in 2018 where there are Private Military Companies for hire. Raiden is a member of Maverick and while attempting to defend a Prime Minister is defeated and given new cyborg equipment. Raiden eventually discovers that a US Senator was assisting in creating more PMC soldiers from orphans and stops the plot.
Finally, Metal Gear Solid: Ground Zeroes is released and shows Big Boss rescuing Paz and Chico from a CIA blacksite base during a nuclear checkout of mother base. When taking Paz back a bomb is surgically removed. Afterwords, events show how Big Boss fell into a coma. 
Which means the rest of the story is on hold until Metal Gear Solid V: Phantom Pain comes out on September first.

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