A plane crashes after its engines go silent. UGM investigates, suspecting monster activity.

UGM is investigating a mountain where Takeshi's class is going for a field trip. Legends say a monster is sealed in the mountain...

The head teacher wants to arrange a marriage for Kyoko. Takeshi wants to put a stop to it, but a monster's appearances keep interfering with his plans.

Takeshi's childhood friend Alma visits Earth. She plays pranks on his students, who take her tricks too seriously.

The Caps of other UGM branches are being mysteriously assassinated. And Japan's Cap has been accused of murder!

Chief Itou comes to Japan to join UGM. He seems too good to be true, but puts the officers through harsh training.

UGM investigates the beautiful space artifact, Snow Art. They decipher a warning left by the Ruriya Aliens, but too late.

The rogue star Red Rose is on a collision course with Earth. UGM plans to save Earth by using nuclear weapons to destroy Red Rose in space.

A crooked village chief hopes to attract tourists to his village with a monster scam. But then the real monster Kiyathi awakens...

Mariko's sick mother loves flowers. When a strange seed lands in Mariko's garden, she tries to make it grow.

Osamu buys a strange fish on his way back from the beach. He puts it in his saltwater tank at home, and it begins to grow...

UGM is on high alert, due to an inversion that causes mirages. But the monster Guwaganda attacks, fueled by a young boy's anger.

Children who won a contest get to tour UGM. Baltan appears to exploit the jealousy of a boy who didn't win.

No one believes Futoshi's father really saw a monster. Does a monster really lurk near Nakatsudai?

Some kids find a UFO. One of them swallows it, and then transforms into a monster.

The sumo spirit Sumo Boy has appeared, wishing only to wrestle. But if angered, he becomes the monster Jihibikirun!

Two men seek a treasure buried beneath an ancient statue of Kannon. Why does young Nobuo hear Kannon calling out to him?

UGM investigates a spaceship crash and recovers a beautiful young woman with amnesia. Why do the Rattler Aliens pursue her?

Masaya tries to hoax his friends with fake UFO photos. Or is he just a pawn of the Baltan Alien?

Children on a ski trip find a magic jar. The jar contains the genie Mahjin, who grants every wish!

Tadashi throws away his baseball glove after he loses a game. Does the glove resent Tadashi?

The Marathon Kid comes down from the mountains to race. But when he grows angry, he becomes the monster Idatenrun!

Saitou's beloved remote controlled Zero Fighter plane goes missing. Is finding it worth an encounter with the monster Balebadon?

Super is unhappy about his sister's impending marriage. A monster appears, behaving as immaturely as Super.

Akio believes that he's an alien from another planet, not a human boy. Can Takeshi help Akio understand the truth?