Ultraman Tiga & Ultraman Dyna & Ultraman Gaia: Battle in Hyperspace is a sequel to the previous year’s Ultraman Tiga & Ultraman Dyna and became second in a successful Ultraman series. This film is the only theatrical spinoff of the Ultraman Gaia TV series.
In a change from previous Ultraman movies, this takes place in our own universe, in which Ultraman is just a popular kids’ TV show.
A young boy named Tsutomu, is failing in school from his addiction to Ultraman. One day, while watching an Ultraman Gaia episode, he gets teleported into hyperspace where he sees a girl and behind her a scene of mass destruction. He later sees that same girl, named Lisa, in his class. Later on, he finds a mysterious glowing ball (Also from the dream) that tells him it can make any wish come true. The one thing Tsutomu wants more than anything else is to meet Gamu, Ultraman’s human counterpart. After his wish is granted, Gamu actually appears, but a bully takes the ball and makes the second wish; for a monster, Satan-biezor, to fight Gamu. After a Gamu transforms into Ultraman Gaia, he finds he is losing power quickly, but manages to defeat the monster regardless.
Afterwards, reverting into Gamu, he is chased by kids through the neighbourhood until he finally manages to elude them by hiding in a toy shop. Once inside though, Tsutomu & his friends find Gamu and Tsutomu explains to Gamu just how he was brought to their world. Tsutomu tries hiding Gamu in an abandoned hanger, and during this time, Gamu sees that Tsutomu has a present for Lisa, a book called “Gulliver’s Travels”, which was a favorite of Gamu’s as a child. While scanning the ball for the answers, not only do the police find him, but Gamu suddenly finds himself back in his own world, and accidentally takes the book with him. He is soon able to recall the events and checks the data he scanned from the ball, and gets a vision telling him that Tsutomu’s world will soon be destroyed…