The Ultraman: S1 E40 - The Boy From The Green Planet The Ultraman

The boy from Planet Opernicus, Fedelico, was taught by Royger that Earthlings are evil, and so takes his pet Monster Orolaan to destroy cities on Earth, but he is repelled by Joneus. Later Fedelico meets Mutsumi and realizes that he was lied to by Royger, but Orolarn is transformed into an evil monster by the Heller Army...