Late one night while en route to Nimbasa City, Ash and his pals are awakened by a UFO! The next day they stop at a café to discuss the sighting. Some townspeople there tell a story of a friend who had a vision of outer space. The townspeople had visited Professor Icarus, who lives over the mountain, to ask him about the event. Very little is known about this professor (a UFO specialist), but when the townspeople confronted him in the past, they all experienced severe head pain. Cilan is a huge fan of the professor and his work, so he decides they need to go to the professor’s laboratory themselves to get to the bottom of the mystery. While crossing a bridge on the way, everyone in the group has another vision—a premonition of danger.
When our heroes arrive at the professor’s house and Cilan explains what a big fan he is, the professor warms up to them and invites them in. The professor describes his theory of dark matter and explains that the UFO they saw is a flying saucer he built when everyone suddenly has a vision of the saucer exploding! Rushing to the lab, they meet the mysterious Pokémon called Elgyem, who shares the professor’s house. They also learn how the two met.
It turns out Elgyem is responsible for the visions everyone saw. When a disguised Team Rocket appears and tries to capture Elgyem, a fierce battle ensues! Our heroes emerge victorious, but not before Team Rocket destroys the professor’s saucer.
The professor vows to rebuild the saucer and take Elgyem back into outer space. But it appears Elgyem is happy living there with Professor Icarus. It’s time for our heroes to move on, so they bid a hearty farewell to the professor and Elgyem and again set their sights on Nimbasa City!