Thunder 3 ⁽⁹⁾

The "Small Three"—ordinary middle school students Pyontaro Tezuka, Hiroshi Ochanomizu, and Tsubame Azuma—accidentally discover a parallel world called the Multiverse after playing a mysterious disc borrowed from their teacher, Dr. Doc. When a lifelike dragonfly emerges from their television screen, Pyontaro's younger sister, Futaba, and their pet dog chase after it, only to be pulled into the Multiverse and captured by its alien inhabitants. The story follows the Small Three as they join forces with the humans of the Multiverse to rescue Futaba and confront the extraterrestrial threats.