THE EARTH IS IN DANGER! Even now, fiendish hands are stretching out from the distant stars to seize the world...

A strange alien rock appearing at the home of TDF agent Ishiguro is the first part of a plot to take over the Earth. Soon an alien plant creature stalking the street and turning its victims into plant monsters themselves.

TDF agents are sent to investigate a crashed alien spacecraft, a strange girl appears and leads our heroes on a merry chase, and soon it is revealed to be a plot to steal Dan's Ultra Eye and his ability to transform into Ultraseven.

A new classified ship for the TDF is sent out to investigate the disappearance of several vessels, unfortunately, this results in the "MAX" being captured in an alien tractor beam and taken into space.

Aliens mind-control a respected TDF scientist to get him to sabotage the Ultra Guard's radar system so that an alien invasion can proceed unchecked.

A shadowy alien appears in Ultra Guard HQ just as an alien space city announces that the Earth must change its orbit or be destroyed.

A violent interstellar fugitive arrives on Earth, the Ultra Guard must track down this killer before the body count climbs any higher.

Residents of a small town start acting violently, members of the Ultra Guard are sent to investigate the cause.

An alien toy maker plans to initiate "Command Zero" which will unleash an army of hypnotized children armed with toys that can actually kill.

A suspicious neighbor leads the Ultra Guard to discover an alien plan to attack the Earth from the Fourth Dimension.

A powerful lightning storm proceeds the arrival of a huge golden dragon, shortly after its arrival there is a mass dying off of young people.

An alien spacecraft blasts its way through Earth's space defenses, destroying two fighters in the process, now on Earth the rogue extraterrestrial needs fuel for its marooned spacecraft.

Captain Kurata of the Earth Space Defense Force takes it personally when he loses some of his men to an alien spacecraft that is now hiding in some nearby mountains.

A series of seemingly unconnected killings is soon revealed to be the work of alien agents who are targeting TDF agents that were traveling incognito.

Ultraseven tries to negotiate peace between Earth and the Alien Pedan, unfortunately the treacherous extraterrestrials only have invasion on the minds.

A probe presumed lost three months ago suddenly returns to Earth. The Ultra Guard is sent to investigate only to see the spacecraft explode shortly after landing. A strange stone found by a young boy could be the answer to this mystery.

An earthquake traps a miner who has a connection to Ultraseven, the Ultra Guard is called in due to the suspicion that the earthquake may be of alien nature.

A day of skydiving lands two members of the Ultra Guard trapped in a mysterious cloud-shrouded forest.

The inventor of a new space barrier to protect the Earth is kidnapped by the self-proclaimed "Emperor of the Universe."

A series of earthquakes lead the Ultra Guard into conflict with aliens from the Dark Nebula.

Many ocean-going vessels start disappearing without a trace, with one SOS stating they were being attacked by the long-since sunken battleship Yamato, which sends the Ultra Guard to investigate a possible alien connection.

A fleet of alien saucers is infesting women with spores to convert them into "Human Farms" in which Earth's women will incubate the alien's food.

A fortune teller predicts an alien attack on a TDF weapon installation and thus becomes targeted by those selfsame aliens.

Aliens operating a "lighthouse" cause a TDF plane to crash into a commercial aircraft, the Ultra Guard are sent to investigate.

A sudden cold front turns is the harbinger of a Third Ice Age as TDF headquarters is slowly turned into a deep freeze by a nasty cold breathing monster.

The Terrestrial Defense Force develops a new super-weapon that can destroy a whole planet and when it is tested against a supposedly uninhabited planet Earth soon finds itself facing a very angry space monster.

The Alien Borg kidnap a member of the TDF and turn him into a cyborg saboteur.

The Ultra Guard uses a car rally as cover for the transportation of a new explosive that is even more powerful than nitroglycerin.

A professor at a local university is discovered to be an alien spy whose new satellite could reveal the Earth's weakness in advance of an alien invasion.

A cocky new member of the Ultra Guard endangers his teammates during the TDF war games.

An alien bacteria turns a young woman into a blood-sucking vampire and Ultraseven must go on a Fantastic Voyage to save her life.

An approaching asteroid turns out to be a strange floating island that emits magnetic jamming waves, ones that not only prevent Ultra Hawks from flying but also stops Dan from turning into Ultraseven.

Walking dead and shadow-men infiltrate TDF headquarters in an attempt to steal top-secret files.

Two members of the Ultra Guard and several city blocks mysteriously vanish, and when aliens gain control of Ultraseven things look very dire.

Two ships of the Ultra Guard are sent to investigate an explosion at a TDF moon base. One of the Ultra Guard members secretly works against his teammates with a strange telekinetic device.

Aliens target the top scientists behind an artificial sun project, a hypnotized TDF agent is a pawn in the alien's plan to assassinate the head scientist.

A young woman steals Dan's Ultra Eye while he is out on patrol, this is the first part of an alien plan to destroy the Earth with an interplanetary missile.

A young boy refuses to give consent for his much needed heart surgery unless Dan of the Ultra Guard attends, unfortunately a giant car eating robot keeps Dan rather busy.

Aliens plot to publicly assassinate Ultraseven so as to break humanity's spirit.

Members of the Ultra Guard scramble madly to save Ultraseven from a dawn execution.

A club searching for the mythical Kappa "water deities" find themselves mixed up with an Ultra Guard investigation of a possible alien invasion.

A race of undersea beings claim to be the "rightful rulers" of the undersea floor, having been driven into the sea by humans eons ago, and now they will fight back against human's further expansion into the sea.

An experimental deep-space rocket goes off course landing Dan and Soga on Earth-like planet where robots have enslaved humanity.

The brutal murder of two police officers leads the Ultra Guard to discover a plot to turn humanity into a race of mindless ape-men.

An alien invasion uses a "Boy Who Cried Wolf" tactic to discredit amateur astronomers so that Ultra Guard will ignore them and thus allow the alien fleet to sneak in undetected.

Aliens kidnap Dan and then unleash their own Ultraseven, a giant robot with all the power of the original.

A man stumbles home drunk one night only to find his wife, kid and neighbors all claiming that they don't know who he is. Dan and Furuhashi investigate and soon discover an alien invasion plot housed in the man's apartment complex.

The numerous fights with alien kaiju have finally taken their toll on Dan/Ultraseven as he finds himself sick and weak, his superior demands he return to the Land of Light to recuperate but he refuses as Earth still needs him.

With Dan/Ultraseven weakened and possibly dying the alien invaders ramp up their plan to conquer the Earth. If mankind doesn't surrender billions will die in "The Biggest Invasion in History."