Alien Mefilas, much like most other aliens of the show, came to Earth to conquer it. Unlike his fellow aliens before him, however, his motive was simply to show off his abilities to the rest of the aliens who had tried to conquer the Earth themselves, such as Kemur and Alien Zarab.

Alien Mefilas's plan was to have a child of the Earth give him the Earth willingly in return for a new star. Hiding in a forest inside his ship, Alien Mefilas spied Shin Hayata, Akiko Fuji, and Akiko's younger brother, Satoru, watching an air show. Alien Mefilas spoke to Satoru, telling him to pay close attention, and then made the air show vanish into the clouds. Hayata and Fuji where baffled, but Satoru was still listening to Alien Mefilas. The alien then put a freighter vessel in place of the air show, then destroyed it in midair. Satoru then told Hayata that someone was talking to him, but before Hayata could do anything, Alien Mefilas captured all three of them.