Ultra Q

While mining a train tunnel between Tokyo & Osaka, a construction crew unearths a strange object from within a huge underground cavern. Unable to identify the object, Jun and Yuriko venture into the tunnel to further investigate. In the meantime, Ippei and a reporter, with the help of a young boy named Liro, discover that the object is the egg of the giant bird called Litra. According to ancient legend, when Litra's egg is found, the giant monster Gomess will appear to destroy the Earth and consequently, Litra will rise up to defend against it.

Amagi Mountain (also known as Saru-yama or Monkey Mountain due to its indigenous monkey population) is discovered to be the home of a 50 meter tall giant monkey, after the animal had ingested green leaf walnuts laced with Helipron G from a nearby research facility (Helipron G, a hormone nutrient developed during World War II for the purpose of strengthening soldiers in battle is found to trigger rapid growth in monkeys following excessive consumption).

When Jun and Yuriko sight a UFO, it is discovered to be a lost space capsule that has returned to Earth after a trip to Mars. The unmanned capsule is found to contain two small gold spheres. Before the objects can be scientifically identified, however, they are stolen by a thief who mistakes them for real gold.

A strange disturbance in Tokyo upturns the ground and shakes the buildings as if something huge is moving beneath the foundations of the city. In the canal of the Imperial Palace, a large tentacle-like vine called Juran appears, frightening passersby. Following this incident, Jun, Ippei and Yuriko witness an underground attack on humans, as the vines try to suck blood from their victims. Dr. Ichinotani suspects that a giant plant has taken root beneath Tokyo.

Acting as a special correspondent for the Daily News, Jun travels to Japan's base at the South Pole. Once there, he learns about the mysterious disappearance of staff member Nomura three years ago, an incident that is made more intriguing by a passage in Nomura's journal which refers to the unknown entity, "Peguila". Yoko Kuhara, staff physician and Nomura's fiance, is also stationed at the base and remains optimistic that they will find the missing Nomura. Soon, strange disturbances begin to take place, as well as a dramatic drop in the region's temperature.

A young boy named Taro develops a curious preoccupation with his pet turtle named Gameron, to whom he constantly encourages to grow. After getting into trouble for bringing his turtle to school and neglecting his studies, Taro winds up in the company of two bumbling gangsters as they flee from the authorities. While hiding out in the sewer, Taro is delighted to find that his turtle has suddenly grown to 99 cm in length. The sight of the giant turtle, however, frightens the gangsters into the welcoming arms of the police. Assuming that Taro had been kidnapped by the two thieves, the authorities return to collect the boy, who is nowhere to be found.