Gen enjoys a day off at an amusement park with his friends. However, a space monster called Guiro has taken up residence there...
Gen enjoys a day off at an amusement park with some of his friends. A boy, Toru, gives his ice cream cone to one of the monsters in a stage show, and the two befriend each-other. Gen sees this, and recognizes the kaiju as an alien, not a suit. They call to the boy, but him and the alien run off.
Gen pursues them in a car. He nearly runs the monster over, but it sprays white goo at his car and grows large. It drives off Gen with the white spray and picks up Toru. Gen transforms into Leo and the two do battle. Leo easily beats up Guiro, but it vanishes before he can finish it off, with Toru.
Later, MAC goes to search for the monster in the park. Toru and Guiro are riding the carousel together. Dan sends Gen to talk to the boy, and MAC surrounds the carousel. Gen gets the boy to get down, and MAC opens fire, to the child's protests. The kaiju vanishes, but the kid is unconscious, trapped in the alien's dream land. He talks in his sleep, telling them not to kill the monster.
Dan trains Gen, telling him Guiro will create more victims. Meanwhile, Toru hears the alien calling and runs from the hospital. MAC detects the monster, and attacks. Inside the monster's scales, Toru calls for them to stop, saying that the monster wants to live peacefully. Enraged, the kaiju begins to rampage.
Finishing his training, Gen runs out and transforms. The two battle, with Toru still in the monster's scales. He manages to knock Toru out of the alien, setting him on the ground. He then destroys the alien. Toru is saddened, but Dan allows Gen to transform and revive Guiro, sending him back to space.
- Veron, Zetton, Woo, Tyrant, Twin Tail, Chinpe, Dorigon and Death Kong King appear as statues and costumes. Toys of Garamon and Arstron are used when Leo first battles Guiro.
- Guiro (First and only appearance)
Ultraman Leo Volume 3 features episodes 9-12, & Complete DVD-Box Features All Episodes.