Create an image of a heroic robot soaring through the skies, its metallic wings gleaming in the sunlight as it defends the city from a swarm of alien invaders with its advanced weapons and technology.

A formidable robot with an imposing, yet heroic demeanor is soaring high in the sunny sky. The light hits its metallic wings, causing them to gleam brilliantly. The robot, equipped with cutting-edge technology and weapons, is in the midst of protecting the city below. Around it hovers an intimidating swarm of alien invaders, their strange and diverse forms foreign to Earth. The city beneath, a mixture of buildings spanning both modern and historical architectures, acts as a stark contrast to the alien invaders, highlighting the striking action scene overhead.