Ultraman: S1 E33 - The Forbidden Words Ultraman

In the middle of an air show, Fuji 's younger brother Satoru witnessed a large tanker flying and exploded. And a mysterious voice spoke to him by telepathy. It was Alien Mefilas which came to invade the Earth. He chooses Satoru as a representative of the earthling, and trys to make him say "I give the earth to you."